固定定位以及三行三列的定位布局

1.在线QQ客服的固定定位

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=qq, initial-scale=1.0" />
    <title>qq</title>
    <style>
      .box {
        height: 15vh;
        width: 40vw;
        background-color: skyblue;
        position: absolute;
      }
    </style>
  </head>
  <body>
    <div class="box">
      <img src="q.png" alt="qq" width="190" height="60" />
    </div>
  </body>
</html>
`

2.三行三列的定位布局

<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=`, initial-scale=1.0" />
    <title>三行三列</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      html {
        font-size: 10px;
      }
      body {
        font-size: 1.6rem;
      }
      header,
      footer {
        height: 6rem;
        background-color: royalblue;
        text-align: center;
      }
      .container {
        margin: 0.1rem 0;
        background-color: olivedrab;
        min-height: calc(100vh - 12.2rem);
        position: relative;
        text-align: center;
      }
      .container aside {
        width: 20rem;
        min-height: inherit;
        position: absolute;
        background-color: orange;
      }
      .container aside:first-of-type {
        left: 0;
        top: 0;
        background-color: red;
      }
      .container aside:last-of-type {
        right: 0;
        top: 0;
      }
      .container main {
        position: absolute;
        left: 20.5rem;
        right: 20.5rem;
        min-height: inherit;
      }
    </style>
  </head>
  <body>
    <header>页眉</header>
    <div class="container">
      <aside>左侧</aside>
      <main>内容区</main>
      <aside>右侧</aside>
    </div>
    <footer>页脚</footer>
  </body>
</html>

1.在线QQ客服的固定定位

2.三行三列的定位布局

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