在线客服固定定位和三行三列布局 -

在线客服固定定位

效果

代码

<!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;
      }
      img {
        position: fixed;
        right: 0;
        top: 20em;
      }
    </style>
  </head>
  <body bgcolor="#2c3e50">
    <img src="./img/QQ截图20210705155538.png" alt="" />
  </body>
</html>

三行三列布局

效果

代码

<!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;
        text-align: center;
        color: white;
        font-size: 30px;
        font-weight: bold;
      }
      html {
        font-size: 10px;
      }
      body {
        font-size: 1.6rem;
      }
      header {
        height: 5rem;
        background-color: #e74645;
      }
      footer {
        height: 5rem;
        background-color: #fb7756;
      }
      main {
        margin: 0.5rem 0;
        min-height: calc(100vh - 11rem);
        position: relative;
      }
      aside {
        width: 20rem;
        min-height: inherit;
        position: absolute;
      }
      aside:first-of-type {
        background-color: #facd60;
        left: 0;
        top: 0;
      }
      aside:last-of-type {
        background-color: #1ac0c6;
        right: 0;
        top: 0;
      }
      .main {
        position: absolute;
        min-height: inherit;
        background-color: #34495e;
        left: 21rem;
        right: 21rem;
      }
    </style>
  </head>
  <body>
    <header>头部</header>
    <main>
      <aside>左侧</aside>
      <div class="main">主题</div>
      <aside>右侧</aside>
    </main>
    <footer>底部</footer>
    <script></script>
  </body>
</html>