CSS 两栏布局

简单CSS布局更新于 2026.06.27
代码实现

HTML208 行
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS 两栏布局</title>
  <style>
    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 24px;
      color: #1f2937;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: #f5f7fb;
    }

    h1,
    h2 {
      margin: 0;
      font-weight: 700;
    }

    h1 {
      margin-bottom: 24px;
      font-size: 28px;
    }

    h2 {
      margin-bottom: 12px;
      font-size: 18px;
    }

    .section {
      margin-bottom: 28px;
    }

    .demo {
      overflow: hidden;
      margin-bottom: 12px;
      border: 1px solid #d8dee9;
      border-radius: 8px;
      background: #ffffff;
    }

    .aside,
    .main {
      min-height: 96px;
      padding: 16px;
    }

    .aside {
      color: #ffffff;
      background: #2563eb;
    }

    .main {
      background: #e5e7eb;
    }

    .flex-layout {
      display: flex;
    }

    .flex-layout .aside {
      flex: 0 0 200px;
    }

    .flex-layout .main {
      flex: 1;
      min-width: 0;
    }

    .grid-layout {
      display: grid;
      grid-template-columns: 200px minmax(0, 1fr);
    }

    .float-layout .aside {
      float: left;
      width: 200px;
    }

    .float-layout .main {
      margin-left: 200px;
    }

    .float-layout::after {
      display: block;
      clear: both;
      content: "";
    }

    pre {
      overflow-x: auto;
      margin: 0;
      padding: 16px;
      border-radius: 8px;
      color: #e5e7eb;
      background: #111827;
      font-size: 14px;
      line-height: 1.6;
    }

    code {
      font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    }

    @media (max-width: 768px) {
      body {
        padding: 16px;
      }

      .flex-layout {
        display: block;
      }

      .grid-layout {
        grid-template-columns: 1fr;
      }

      .float-layout .aside {
        float: none;
        width: auto;
      }

      .float-layout .main {
        margin-left: 0;
      }
    }
  </style>
</head>
<body>
  <h1>CSS 两栏布局</h1>

  <section class="section">
    <h2>1. Flex：左侧固定，右侧自适应</h2>
    <div class="demo flex-layout">
      <aside class="aside">左侧 200px</aside>
      <main class="main">右侧自适应</main>
    </div>
    <pre><code>.layout {
  display: flex;
}

.left {
  flex: 0 0 200px;
}

.right {
  flex: 1;
  min-width: 0;
}</code></pre>
  </section>

  <section class="section">
    <h2>2. Grid：左侧固定，右侧自适应</h2>
    <div class="demo grid-layout">
      <aside class="aside">左侧 200px</aside>
      <main class="main">右侧自适应</main>
    </div>
    <pre><code>.layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
}</code></pre>
  </section>

  <section class="section">
    <h2>3. Float：左侧固定，右侧自适应</h2>
    <div class="demo float-layout">
      <aside class="aside">左侧 200px</aside>
      <main class="main">右侧自适应</main>
    </div>
    <pre><code>.left {
  float: left;
  width: 200px;
}

.right {
  margin-left: 200px;
}

.layout::after {
  display: block;
  clear: both;
  content: "";
}</code></pre>
  </section>

  <section class="section">
    <h2>4. 响应式：窄屏变单列</h2>
    <pre><code>@media (max-width: 768px) {
  .layout {
    display: block;
    grid-template-columns: 1fr;
  }

  .left,
  .right {
    width: auto;
    margin-left: 0;
  }
}</code></pre>
  </section>
</body>
</html>