简单的3行3列布局和固定定位

效果图

代码如下：

1.主要用到三个属性 position: absolute;position: relative;position: fixed;

<!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>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      :root {
        font-size: 10px;
      }
      header,
      footer {
        height: 5rem;
        background: #522332;
      }
      .container {
        min-height: 40rem;
        position: relative;
        margin: 0.5rem 0;
      }
      .container aside {
        width: 15rem;
        background: #5646;
        min-height: inherit;
        position: absolute;
      }
      .container aside:first-of-type {
        left: 0;
        top: 0;
      }
      .container aside:last-of-type {
        right: 0;
        top: 0;
      }
      body {
        position: relative;
      }
      .container main {
        min-height: inherit;
        background: burlywood;
        position: absolute;
        left: 15.5rem;
        right: 15.5rem;
      }
      .container main img {
        position: fixed;
        left: 20rem;
        top: 10rem;
      }
    </style>
  </head>
  <body>
    <header>页眉</header>
    <div class="container">
      <aside>左侧</aside>
      <main>
        <img src="111.png" alt="" />
      </main>
      <aside>右侧</aside>
    </div>
    <footer>底部</footer>
  </body>
</html>

Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：

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简单的3行3列布局和固定定位