Flex布局案例

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Flex布局-圣杯模式</title>
  </head>
  <body>
    <header>页眉</header>
    <div class="flex-container">
      <div class="item left">left</div>
      <div class="item main">main</div>
      <div class="item right">right</div>
    </div>
    <footer>页脚</footer>
    <style>
      * {
        padding: 0;
        margin: 0;
        box-sizing: border-box;
      }
      :root {
        font-size: 10px;
      }
      body {
        min-width: 48rem;
      }
      header,
      footer {
        background-color: lightgray;
        height: 10em;
      }
      .flex-container {
        display: flex;
        min-height: 60em;
      }
      .left,
      .right {
        background-color: lightseagreen;
        flex: 0 0 16em;
      }
      .main {
        flex: 1;
      }
    </style>
  </body>
</html>
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