css基础：底部固定，导航栏浮动在顶部

场景：底部浮动在底部，导致栏如果下面内容过长浮动在顶部，用到的是position:sticky

一、方法一

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <style>
    body {
      margin: 0;
      padding: 0;
    }
    .detail {
      width: 100%;
      height: 100vh;
      display: flex;
      flex-direction: column;
      overflow: auto;
    }
    .header {
      background-color: pink;
      width: 100%;
      height: 200px;
      padding: 12px 24px;
      box-sizing: border-box;
    }
    .tabs {
      position: sticky;
      top: 0;
      height: 32px;
      line-height: 32px;
      background: yellow;
      border-radius: 8px;
      padding-left: 30px;
      display: flex;
      align-items: center;
      z-index: 9;
    }
    .tabContent {
      flex: 1;
      background: orange;
    }
    .box {
      height: 1000px;
      border: 2px solid red;
    }
    .footer {
      position: sticky;
      width: 100%;
      background: gray;
      padding: 16px;
      box-sizing: border-box;
      bottom: 0;
      z-index: 10;
      display: flex;
      flex-direction: column;
    }
  </style>
  <body>
    <div class="detail">
      <div class="header">头部</div>
      <div class="tabs">tabs内容</div>
      <div class="tabContent">
        <div class="box">这是里内容模块</div>
      </div>
      <div class="footer">底部</div>
    </div>
  </body>
</html>