HTML/CSS 基本ガイド
HTML/CSS 101：完全かつ包括的なガイド
ウェブデザインと開発において、HTML（HyperText Markup Language）とCSS（Cascading Style Sheets）は基盤となる重要な技術です。HTMLはウェブページの構造を作り、CSSはその見た目をデザインします。このガイドでは、HTMLとCSSの基本を説明し、これらの技術がどのように組み合わさってウェブページを作成するのかを理解できるように詳しく解説します。
1. HTMLの基本
HTMLはウェブページの「骨組み」を作るための言語です。HTMLファイルは、タグと呼ばれる特定の要素を使って、コンテンツを構造的に記述します。各タグは特定の目的を持っており、テキスト、画像、リンク、フォームなどを表示するために使用されます。
1.1 HTMLの基本的な構造
HTML文書の基本的な構造は以下のようになります。
このコードは、ウェブブラウザに「HTMLの基本」と表示されるページを作成します。ここで重要なタグを見てみましょう。
-
: HTML5を使用していることを宣言します。 -
: HTML文書の開始を示すタグです。 -
: メタ情報（文字セット、ビューポート設定、タイトルなど）を含む部分です。 -
: 文書の文字エンコーディングを設定します。 -
</code>: ウェブブラウザのタブに表示されるページタイトルを設定します。</p> </li> <li data-start="958" data-end="992" class="" style=""> <p data-start="960" data-end="992" class=""><code data-start="960" data-end="968"><body></code>: ウェブページのコンテンツが含まれる部分です。</p> </li> <li data-start="993" data-end="1025" class="" style=""> <p data-start="995" data-end="1025" class=""><code data-start="995" data-end="1001"></p> <h1></code>: 見出しタグで、最も重要な見出しを表示します。</p> </li> <li data-start="1026" data-end="1050" class="" style=""> <p data-start="1028" data-end="1050" class=""><code data-start="1028" data-end="1033"></p> <p></code>: 段落を作成するためのタグです。</p> </li> </ul> <h4 data-start="1052" data-end="1073" class=""><span class="ez-toc-section" id="12_%E3%82%88%E3%81%8F%E4%BD%BF%E3%82%8F%E3%82%8C%E3%82%8BHTML%E3%82%BF%E3%82%B0"></span>1.2 よく使われるHTMLタグ<span class="ez-toc-section-end"></span></h4> <p data-start="1075" data-end="1099" class="">HTMLでよく使われるタグをいくつか紹介します。</p> <ul data-start="1101" data-end="1336"> <li data-start="1101" data-end="1142" class="" style=""> <p data-start="1103" data-end="1142" class=""><code data-start="1103" data-end="1126"><a href="URL">リンク</a></code>: ハイパーリンクを作成します。</p> </li> <li data-start="1143" data-end="1187" class="" style=""> <p data-start="1145" data-end="1187" class=""><code data-start="1145" data-end="1176"><img decoding="async" src="画像URL" alt="画像の説明"></code>: 画像を表示します。</p> </li> <li data-start="1188" data-end="1241" class="" style=""> <p data-start="1190" data-end="1241" class=""><code data-start="1190" data-end="1196"></p> <ul></code>, <code data-start="1198" data-end="1204"></p> <ol></code>, <code data-start="1206" data-end="1212"></p> <li></code>: 順不同リスト、順序付きリスト、リスト項目を作成します。</p> </li> <li data-start="1242" data-end="1287" class="" style=""> <p data-start="1244" data-end="1287" class=""><code data-start="1244" data-end="1253"></p> <table></code>, <code data-start="1255" data-end="1261"></p> <tr></code>, <code data-start="1263" data-end="1269"></p> <td></code>: テーブル、行、セルを作成します。</p> </li> <li data-start="1288" data-end="1336" class="" style=""> <p data-start="1290" data-end="1336" class=""><code data-start="1290" data-end="1298"></p> <form></code>, <code data-start="1300" data-end="1309"><input></code>, <code data-start="1311" data-end="1321"><button></code>: フォーム要素を作成します。</p> </li> </ul> <h3 data-start="1338" data-end="1351" class=""><span class="ez-toc-section" id="2_CSS%E3%81%AE%E5%9F%BA%E6%9C%AC"></span>2. CSSの基本<span class="ez-toc-section-end"></span></h3> <p data-start="1353" data-end="1457" class="">CSSは、HTMLで作成したページのデザインを担当する言語です。色、フォント、レイアウトなどを指定することができます。CSSを使うことで、ウェブページを美しく、そしてユーザーにとって使いやすいものにできます。</p> <h4 data-start="1459" data-end="1478" class=""><span class="ez-toc-section" id="21_CSS%E3%81%AE%E5%9F%BA%E6%9C%AC%E7%9A%84%E3%81%AA%E6%A7%8B%E9%80%A0"></span>2.1 CSSの基本的な構造<span class="ez-toc-section-end"></span></h4> <p data-start="1480" data-end="1534" class="">CSSは、スタイルシートとしてHTML文書に組み込まれます。以下のように、スタイルを定義することができます。</p> <pre class="!overflow-visible" data-start="1536" data-end="1667"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">css</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-css"><span><span><span class="hljs-selector-tag">body</span></span><span> { </span><span><span class="hljs-attribute">font-family</span></span><span>: Arial, sans-serif; </span><span><span class="hljs-attribute">background-color</span></span><span>: </span><span><span class="hljs-number">#f4f4f4</span></span><span>; </span><span><span class="hljs-attribute">color</span></span><span>: </span><span><span class="hljs-number">#333</span></span><span>; } </span><span><span class="hljs-selector-tag">h1</span></span><span> { </span><span><span class="hljs-attribute">color</span></span><span>: </span><span><span class="hljs-number">#007bff</span></span><span>; } </span></span></code></div></div></pre> <p data-start="1669" data-end="1735" class="">上記のコードは、<code data-start="1677" data-end="1683">body</code>タグに適用されるフォントや背景色、文字色を指定しています。<code data-start="1712" data-end="1716">h1</code>タグには青色のテキストが適用されます。</p> <h4 data-start="1737" data-end="1760" class=""><span class="ez-toc-section" id="22_CSS%E3%81%AE%E9%81%B8%E6%8A%9E%E5%AD%90%EF%BC%88%E3%82%BB%E3%83%AC%E3%82%AF%E3%82%BF%E3%83%BC%EF%BC%89"></span>2.2 CSSの選択子（セレクター）<span class="ez-toc-section-end"></span></h4> <p data-start="1762" data-end="1817" class="">CSSでは、HTMLの特定の要素にスタイルを適用するために選択子を使用します。代表的な選択子を以下に示します。</p> <ul data-start="1819" data-end="2031"> <li data-start="1819" data-end="1855" class="" style=""> <p data-start="1821" data-end="1855" class=""><code data-start="1821" data-end="1824">*</code>（全選択子）: ページ内のすべての要素にスタイルを適用します。</p> </li> <li data-start="1856" data-end="1910" class="" style=""> <p data-start="1858" data-end="1910" class=""><code data-start="1858" data-end="1867">element</code>（要素選択子）: 特定のHTML要素にスタイルを適用します（例：<code data-start="1899" data-end="1903">h1</code>, <code data-start="1905" data-end="1908">p</code>）。</p> </li> <li data-start="1911" data-end="1973" class="" style=""> <p data-start="1913" data-end="1973" class=""><code data-start="1913" data-end="1921">.class</code>（クラス選択子）: 特定のクラスにスタイルを適用します（例：<code data-start="1951" data-end="1957">.btn</code>, <code data-start="1959" data-end="1971">.container</code>）。</p> </li> <li data-start="1974" data-end="2031" class="" style=""> <p data-start="1976" data-end="2031" class=""><code data-start="1976" data-end="1981">#id</code>（ID選択子）: 特定のIDにスタイルを適用します（例：<code data-start="2009" data-end="2018">#header</code>, <code data-start="2020" data-end="2029">#footer</code>）。</p> </li> </ul> <h4 data-start="2033" data-end="2051" class=""><span class="ez-toc-section" id="23_CSS%E3%81%AE%E3%83%97%E3%83%AD%E3%83%91%E3%83%86%E3%82%A3"></span>2.3 CSSのプロパティ<span class="ez-toc-section-end"></span></h4> <p data-start="2053" data-end="2104" class="">CSSでは、各選択子に対してプロパティと値を設定します。いくつかの代表的なプロパティは以下の通りです。</p> <ul data-start="2106" data-end="2322"> <li data-start="2106" data-end="2130" class="" style=""> <p data-start="2108" data-end="2130" class=""><code data-start="2108" data-end="2115">color</code>: テキストの色を指定します。</p> </li> <li data-start="2131" data-end="2163" class="" style=""> <p data-start="2133" data-end="2163" class=""><code data-start="2133" data-end="2151">background-color</code>: 背景色を指定します。</p> </li> <li data-start="2164" data-end="2194" class="" style=""> <p data-start="2166" data-end="2194" class=""><code data-start="2166" data-end="2177">font-size</code>: フォントのサイズを指定します。</p> </li> <li data-start="2195" data-end="2222" class="" style=""> <p data-start="2197" data-end="2222" class=""><code data-start="2197" data-end="2205">margin</code>: 要素の外側の余白を指定します。</p> </li> <li data-start="2223" data-end="2251" class="" style=""> <p data-start="2225" data-end="2251" class=""><code data-start="2225" data-end="2234">padding</code>: 要素の内側の余白を指定します。</p> </li> <li data-start="2252" data-end="2276" class="" style=""> <p data-start="2254" data-end="2276" class=""><code data-start="2254" data-end="2262">border</code>: 要素の枠線を指定します。</p> </li> <li data-start="2277" data-end="2322" class="" style=""> <p data-start="2279" data-end="2322" class=""><code data-start="2279" data-end="2288">display</code>: 要素の表示方法（ブロック要素やインライン要素など）を指定します。</p> </li> </ul> <h3 data-start="2324" data-end="2345" class=""><span class="ez-toc-section" id="3_HTML%E3%81%A8CSS%E3%81%AE%E7%B5%84%E3%81%BF%E5%90%88%E3%82%8F%E3%81%9B"></span>3. HTMLとCSSの組み合わせ<span class="ez-toc-section-end"></span></h3> <p data-start="2347" data-end="2460" class="">HTMLとCSSを組み合わせて、より魅力的なウェブページを作成できます。HTMLはコンテンツの構造を作り、CSSはその構造をスタイリングします。実際にHTMLとCSSを組み合わせて、シンプルなウェブページを作成してみましょう。</p> <h4 data-start="2462" data-end="2483" class=""><span class="ez-toc-section" id="31_%E4%BE%8B%EF%BC%9A%E5%9F%BA%E6%9C%AC%E7%9A%84%E3%81%AA%E3%82%A6%E3%82%A7%E3%83%96%E3%83%9A%E3%83%BC%E3%82%B8"></span>3.1 例：基本的なウェブページ<span class="ez-toc-section-end"></span></h4> <p data-start="2485" data-end="2520" class="">以下は、HTMLとCSSを組み合わせたシンプルなウェブページの例です。</p> <pre class="!overflow-visible" data-start="2522" data-end="3464"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">html</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-html"><span><span><span class="hljs-meta"><!DOCTYPE <span class="hljs-keyword">html</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">html</span></span></span><span> </span><span><span class="hljs-attr">lang</span></span><span>=</span><span><span class="hljs-string">"ja"</span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">head</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">meta</span></span></span><span> </span><span><span class="hljs-attr">charset</span></span><span>=</span><span><span class="hljs-string">"UTF-8"</span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">meta</span></span></span><span> </span><span><span class="hljs-attr">name</span></span><span>=</span><span><span class="hljs-string">"viewport"</span></span><span> </span><span><span class="hljs-attr">content</span></span><span>=</span><span><span class="hljs-string">"width=device-width, initial-scale=1.0"</span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">title</span></span></span><span>>シンプルなウェブページ</span><span><span class="hljs-tag"></<span class="hljs-name">title</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">style</span></span></span><span>><span class="language-css"> </span></span><span><span class="hljs-selector-tag">body</span></span><span> { </span><span><span class="hljs-attribute">font-family</span></span><span>: </span><span><span class="hljs-string">'Arial'</span></span><span>, sans-serif; </span><span><span class="hljs-attribute">margin</span></span><span>: </span><span><span class="hljs-number">0</span></span><span>; </span><span><span class="hljs-attribute">padding</span></span><span>: </span><span><span class="hljs-number">0</span></span><span>; </span><span><span class="hljs-attribute">background-color</span></span><span>: </span><span><span class="hljs-number">#f8f9fa</span></span><span>; } </span><span><span class="hljs-selector-tag">header</span></span><span> { </span><span><span class="hljs-attribute">background-color</span></span><span>: </span><span><span class="hljs-number">#007bff</span></span><span>; </span><span><span class="hljs-attribute">color</span></span><span>: white; </span><span><span class="hljs-attribute">padding</span></span><span>: </span><span><span class="hljs-number">20px</span></span><span>; </span><span><span class="hljs-attribute">text-align</span></span><span>: center; } </span><span><span class="hljs-selector-class">.content</span></span><span> { </span><span><span class="hljs-attribute">padding</span></span><span>: </span><span><span class="hljs-number">20px</span></span><span>; } </span><span><span class="hljs-selector-tag">footer</span></span><span> { </span><span><span class="hljs-attribute">text-align</span></span><span>: center; </span><span><span class="hljs-attribute">padding</span></span><span>: </span><span><span class="hljs-number">10px</span></span><span>; </span><span><span class="hljs-attribute">background-color</span></span><span>: </span><span><span class="hljs-number">#343a40</span></span><span>; </span><span><span class="hljs-attribute">color</span></span><span>: white; } </span><span><span class="hljs-tag"></<span class="hljs-name">style</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">head</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">body</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">header</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">h1</span></span></span><span>>ウェブページのヘッダー</span><span><span class="hljs-tag"></<span class="hljs-name">h1</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">header</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">div</span></span></span><span> </span><span><span class="hljs-attr">class</span></span><span>=</span><span><span class="hljs-string">"content"</span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>これはシンプルなウェブページです。</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">div</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">footer</span></span></span><span>> </span><span><span class="hljs-tag"><<span class="hljs-name">p</span></span></span><span>>© 2025 ウェブページのフッター</span><span><span class="hljs-tag"></<span class="hljs-name">p</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">footer</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">body</span></span></span><span>> </span><span><span class="hljs-tag"></<span class="hljs-name">html</span></span></span><span>> </span></span></code></div></div></pre> <p data-start="3466" data-end="3564" class="">このコードでは、HTMLでヘッダー、コンテンツ、フッターを作成し、それぞれにCSSでスタイルを適用しています。背景色や文字色、パディングなどのスタイルを使って、ページ全体のデザインを整えています。</p> <h3 data-start="3566" data-end="3583" class=""><span class="ez-toc-section" id="4_%E3%83%AC%E3%82%B9%E3%83%9D%E3%83%B3%E3%82%B7%E3%83%96%E3%83%87%E3%82%B6%E3%82%A4%E3%83%B3"></span>4. レスポンシブデザイン<span class="ez-toc-section-end"></span></h3> <p data-start="3585" data-end="3722" class="">現代のウェブページは、デスクトップ、タブレット、スマートフォンなど、さまざまなデバイスで表示されることを考慮する必要があります。レスポンシブデザインは、異なる画面サイズに対応するウェブページを作成するための技術です。これを実現するために、CSSのメディアクエリを使用します。</p> <pre class="!overflow-visible" data-start="3724" data-end="3851"><div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary"><div class="flex items-center text-token-text-secondary px-4 py-2 text-xs font-sans justify-between h-9 bg-token-sidebar-surface-primary dark:bg-token-main-surface-secondary select-none rounded-t-[5px]">css</div><div class="sticky top-9"><div class="absolute bottom-0 right-0 flex h-9 items-center pr-2"><div class="flex items-center rounded bg-token-sidebar-surface-primary px-2 font-sans text-xs text-token-text-secondary dark:bg-token-main-surface-secondary"><span class="" data-state="closed"><button class="flex gap-1 items-center select-none px-4 py-1" aria-label="Copy"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path fill-rule="evenodd" clip-rule="evenodd" d="M7 5C7 3.34315 8.34315 2 10 2H19C20.6569 2 22 3.34315 22 5V14C22 15.6569 20.6569 17 19 17H17V19C17 20.6569 15.6569 22 14 22H5C3.34315 22 2 20.6569 2 19V10C2 8.34315 3.34315 7 5 7H7V5ZM9 7H14C15.6569 7 17 8.34315 17 10V15H19C19.5523 15 20 14.5523 20 14V5C20 4.44772 19.5523 4 19 4H10C9.44772 4 9 4.44772 9 5V7ZM5 9C4.44772 9 4 9.44772 4 10V19C4 19.5523 4.44772 20 5 20H14C14.5523 20 15 19.5523 15 19V10C15 9.44772 14.5523 9 14 9H5Z" fill="currentColor"></path></svg>Copy</button></span><span class="" data-state="closed"><button class="flex select-none items-center gap-1 px-4 py-1"><svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" class="icon-xs"><path d="M2.5 5.5C4.3 5.2 5.2 4 5.5 2.5C5.8 4 6.7 5.2 8.5 5.5C6.7 5.8 5.8 7 5.5 8.5C5.2 7 4.3 5.8 2.5 5.5Z" fill="currentColor" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round"></path><path d="M5.66282 16.5231L5.18413 19.3952C5.12203 19.7678 5.09098 19.9541 5.14876 20.0888C5.19933 20.2067 5.29328 20.3007 5.41118 20.3512C5.54589 20.409 5.73218 20.378 6.10476 20.3159L8.97693 19.8372C9.72813 19.712 10.1037 19.6494 10.4542 19.521C10.7652 19.407 11.0608 19.2549 11.3343 19.068C11.6425 18.8575 11.9118 18.5882 12.4503 18.0497L20 10.5C21.3807 9.11929 21.3807 6.88071 20 5.5C18.6193 4.11929 16.3807 4.11929 15 5.5L7.45026 13.0497C6.91175 13.5882 6.6425 13.8575 6.43197 14.1657C6.24513 14.4392 6.09299 14.7348 5.97903 15.0458C5.85062 15.3963 5.78802 15.7719 5.66282 16.5231Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path><path d="M14.5 7L18.5 11" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"></path></svg>Edit</button></span></div></div></div><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre language-css"><span><span><span class="hljs-keyword">@media</span></span><span> (</span><span><span class="hljs-attribute">max-width</span></span><span>: </span><span><span class="hljs-number">768px</span></span><span>) { </span><span><span class="hljs-selector-tag">body</span></span><span> { </span><span><span class="hljs-attribute">font-size</span></span><span>: </span><span><span class="hljs-number">14px</span></span><span>; } </span><span><span class="hljs-selector-tag">header</span></span><span> { </span><span><span class="hljs-attribute">text-align</span></span><span>: left; } } </span></span></code></div></div></pre> <p data-start="3853" data-end="3933" class="">上記のCSSコードは、画面幅が768ピクセル以下のデバイス（スマートフォンやタブレット）で、フォントサイズを小さくし、ヘッダーのテキストを左寄せにする設定です。</p> <h3 data-start="3935" data-end="3945" class=""><span class="ez-toc-section" id="5_%E3%81%BE%E3%81%A8%E3%82%81"></span>5. まとめ<span class="ez-toc-section-end"></span></h3> <p data-start="3947" data-end="4105" class="">HTMLとCSSは、ウェブ開発の基本中の基本です。HTMLはウェブページの構造を作り、CSSはそのデザインを整えます。これらをうまく組み合わせることで、機能的で美しいウェブページを作成することができます。今回紹介した基本的なタグやプロパティを理解し、実際に手を動かしてコードを書くことで、より深く学んでいきましょう。</p> </div> </div> </div> </p> </div><!-- .entry-content /--> <div id="post-extra-info"> <div class="theiaStickySidebar"> <div class="single-post-meta post-meta clearfix"><span class="meta-item last-updated">最終更新： 24/03/2025</span><div class="tie-alignright"><span class="meta-reading-time meta-item"><span class="tie-icon-bookmark" aria-hidden="true"></span> 1 分の読み</span> </div></div><!-- .post-meta --> <div id="share-buttons-top" class="share-buttons share-buttons-top"> <div class="share-links share-centered icons-only share-rounded"> <a href="https://www.facebook.com/sharer.php?u=https://bunkao.com/html-css-%e5%9f%ba%e6%9c%ac%e3%82%ac%e3%82%a4%e3%83%89/" rel="external noopener nofollow" title="Facebook" target="_blank" class="facebook-share-btn " data-raw="https://www.facebook.com/sharer.php?u={post_link}"> <span 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HTML\u306e\u57fa\u672c\nHTML\u306f\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u300c\u9aa8\u7d44\u307f\u300d\u3092\u4f5c\u308b\u305f\u3081\u306e\u8a00\u8a9e\u3067\u3059\u3002HTML\u30d5\u30a1\u30a4\u30eb\u306f\u3001\u30bf\u30b0\u3068\u547c\u3070\u308c\u308b\u7279\u5b9a\u306e\u8981\u7d20\u3092\u4f7f\u3063\u3066\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u69cb\u9020\u7684\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002\u5404\u30bf\u30b0\u306f\u7279\u5b9a\u306e\u76ee\u7684\u3092\u6301\u3063\u3066\u304a\u308a\u3001\u30c6\u30ad\u30b9\u30c8\u3001\u753b\u50cf\u3001\u30ea\u30f3\u30af\u3001\u30d5\u30a9\u30fc\u30e0\u306a\u3069\u3092\u8868\u793a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\n1.1 HTML\u306e\u57fa\u672c\u7684\u306a\u69cb\u9020\nHTML\u6587\u66f8\u306e\u57fa\u672c\u7684\u306a\u69cb\u9020\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\nhtmlCopyEdit\n\n\n \n \n HTML\u306e\u57fa\u672c\n\n\n \u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u30bf\u30a4\u30c8\u30eb\n \u3053\u308c\u306fHTML\u306e\u57fa\u672c\u7684\u306a\u30da\u30fc\u30b8\u3067\u3059\u3002\n\n\n\n\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u306b\u300cHTML\u306e\u57fa\u672c\u300d\u3068\u8868\u793a\u3055\u308c\u308b\u30da\u30fc\u30b8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u91cd\u8981\u306a\u30bf\u30b0\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\n\n\n: HTML5\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u5ba3\u8a00\u3057\u307e\u3059\u3002\n\n\n: HTML\u6587\u66f8\u306e\u958b\u59cb\u3092\u793a\u3059\u30bf\u30b0\u3067\u3059\u3002\n\n\n: \u30e1\u30bf\u60c5\u5831\uff08\u6587\u5b57\u30bb\u30c3\u30c8\u3001\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u8a2d\u5b9a\u3001\u30bf\u30a4\u30c8\u30eb\u306a\u3069\uff09\u3092\u542b\u3080\u90e8\u5206\u3067\u3059\u3002\n\n\n: \u6587\u66f8\u306e\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\n\n\n: \u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u306e\u30bf\u30d6\u306b\u8868\u793a\u3055\u308c\u308b\u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\n\n\n: \u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u542b\u307e\u308c\u308b\u90e8\u5206\u3067\u3059\u3002\n\n\n: \u898b\u51fa\u3057\u30bf\u30b0\u3067\u3001\u6700\u3082\u91cd\u8981\u306a\u898b\u51fa\u3057\u3092\u8868\u793a\u3057\u307e\u3059\u3002\n\n\n: \u6bb5\u843d\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30bf\u30b0\u3067\u3059\u3002\n\n\n1.2 \u3088\u304f\u4f7f\u308f\u308c\u308bHTML\u30bf\u30b0\nHTML\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b\u30bf\u30b0\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\u3057\u307e\u3059\u3002\n\n\n\u30ea\u30f3\u30af: \u30cf\u30a4\u30d1\u30fc\u30ea\u30f3\u30af\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\n\n\n: \u753b\u50cf\u3092\u8868\u793a\u3057\u307e\u3059\u3002\n\n\n, , : \u9806\u4e0d\u540c\u30ea\u30b9\u30c8\u3001\u9806\u5e8f\u4ed8\u304d\u30ea\u30b9\u30c8\u3001\u30ea\u30b9\u30c8\u9805\u76ee\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\n\n\n, , : \u30c6\u30fc\u30d6\u30eb\u3001\u884c\u3001\u30bb\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\n\n\n, , : \u30d5\u30a9\u30fc\u30e0\u8981\u7d20\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\n\n\n2. CSS\u306e\u57fa\u672c\nCSS\u306f\u3001HTML\u3067\u4f5c\u6210\u3057\u305f\u30da\u30fc\u30b8\u306e\u30c7\u30b6\u30a4\u30f3\u3092\u62c5\u5f53\u3059\u308b\u8a00\u8a9e\u3067\u3059\u3002\u8272\u3001\u30d5\u30a9\u30f3\u30c8\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306a\u3069\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002CSS\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u3092\u7f8e\u3057\u304f\u3001\u305d\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u4f7f\u3044\u3084\u3059\u3044\u3082\u306e\u306b\u3067\u304d\u307e\u3059\u3002\n2.1 CSS\u306e\u57fa\u672c\u7684\u306a\u69cb\u9020\nCSS\u306f\u3001\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u3068\u3057\u3066HTML\u6587\u66f8\u306b\u7d44\u307f\u8fbc\u307e\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3001\u30b9\u30bf\u30a4\u30eb\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\ncssCopyEditbody {\n font-family: Arial, sans-serif;\n background-color: #f4f4f4;\n color: #333;\n}\n\nh1 {\n color: #007bff;\n}\n\n\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306f\u3001body\u30bf\u30b0\u306b\u9069\u7528\u3055\u308c\u308b\u30d5\u30a9\u30f3\u30c8\u3084\u80cc\u666f\u8272\u3001\u6587\u5b57\u8272\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002h1\u30bf\u30b0\u306b\u306f\u9752\u8272\u306e\u30c6\u30ad\u30b9\u30c8\u304c\u9069\u7528\u3055\u308c\u307e\u3059\u3002\n2.2 CSS\u306e\u9078\u629e\u5b50\uff08\u30bb\u30ec\u30af\u30bf\u30fc\uff09\nCSS\u3067\u306f\u3001HTML\u306e\u7279\u5b9a\u306e\u8981\u7d20\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308b\u305f\u3081\u306b\u9078\u629e\u5b50\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a\u9078\u629e\u5b50\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\u3002\n\n\n*\uff08\u5168\u9078\u629e\u5b50\uff09: \u30da\u30fc\u30b8\u5185\u306e\u3059\u3079\u3066\u306e\u8981\u7d20\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u307e\u3059\u3002\n\n\nelement\uff08\u8981\u7d20\u9078\u629e\u5b50\uff09: \u7279\u5b9a\u306eHTML\u8981\u7d20\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u307e\u3059\uff08\u4f8b\uff1ah1, p\uff09\u3002\n\n\n.class\uff08\u30af\u30e9\u30b9\u9078\u629e\u5b50\uff09: \u7279\u5b9a\u306e\u30af\u30e9\u30b9\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u307e\u3059\uff08\u4f8b\uff1a.btn, .container\uff09\u3002\n\n\n#id\uff08ID\u9078\u629e\u5b50\uff09: \u7279\u5b9a\u306eID\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u307e\u3059\uff08\u4f8b\uff1a#header, #footer\uff09\u3002\n\n\n2.3 CSS\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\nCSS\u3067\u306f\u3001\u5404\u9078\u629e\u5b50\u306b\u5bfe\u3057\u3066\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306e\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002\n\n\ncolor: \u30c6\u30ad\u30b9\u30c8\u306e\u8272\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\nbackground-color: \u80cc\u666f\u8272\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\nfont-size: \u30d5\u30a9\u30f3\u30c8\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\nmargin: \u8981\u7d20\u306e\u5916\u5074\u306e\u4f59\u767d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\npadding: \u8981\u7d20\u306e\u5185\u5074\u306e\u4f59\u767d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\nborder: \u8981\u7d20\u306e\u67a0\u7dda\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\ndisplay: \u8981\u7d20\u306e\u8868\u793a\u65b9\u6cd5\uff08\u30d6\u30ed\u30c3\u30af\u8981\u7d20\u3084\u30a4\u30f3\u30e9\u30a4\u30f3\u8981\u7d20\u306a\u3069\uff09\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\n\n\n3. HTML\u3068CSS\u306e\u7d44\u307f\u5408\u308f\u305b\nHTML\u3068CSS\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u3088\u308a\u9b45\u529b\u7684\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002HTML\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u69cb\u9020\u3092\u4f5c\u308a\u3001CSS\u306f\u305d\u306e\u69cb\u9020\u3092\u30b9\u30bf\u30a4\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002\u5b9f\u969b\u306bHTML\u3068CSS\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\n3.1 \u4f8b\uff1a\u57fa\u672c\u7684\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\n\u4ee5\u4e0b\u306f\u3001HTML\u3068CSS\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30b7\u30f3\u30d7\u30eb\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u4f8b\u3067\u3059\u3002\nhtmlCopyEdit\n\n\n \n \n \u30b7\u30f3\u30d7\u30eb\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\n \n body {\n font-family: 'Arial', sans-serif;\n margin: 0;\n padding: 0;\n background-color: #f8f9fa;\n }\n header {\n background-color: #007bff;\n color: white;\n padding: 20px;\n text-align: center;\n }\n .content {\n padding: 20px;\n }\n footer {\n text-align: center;\n padding: 10px;\n background-color: #343a40;\n color: white;\n }\n \n\n\n \n \u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u30d8\u30c3\u30c0\u30fc\n \n \n \u3053\u308c\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u3067\u3059\u3002\n \n \n \u00a9 2025 \u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u30d5\u30c3\u30bf\u30fc\n 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