css 实现时间轴节点

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    *, *:after, *:before {
      box-sizing: border-box;
    }
    .main {
      width: 90%;
      max-width: 69em;
      margin: 0 auto;
      padding: 0 1.875em 3.125em 1.875em;
    }
    .box {
      margin: 30px 0 0 0;
      padding: 0;
      list-style: none;
      position: relative;
    }
    .box li .myContent p:before {
      content: '';
      position: absolute;
      top: 50px;
      bottom: 0;
      width: 1px;
      border: 1px dashed #ccc;
      left: -7.5%;
    }
    .box > li {
      position: relative;
    }
    .box > li .cbp_tmtime {
      display: block;
      width: 25%;
      padding-right: 100px;
      position: absolute;
    }
    .box > li .SerialNumber {
      width: 40px;
      height: 40px;
      border:1px solid #ccc;
      border-radius: 50%;
      font-family: 'ecoico';
      speak: none;
      font-style: normal;
      font-weight: normal;
      font-variant: normal;
      text-transform: none;
      font-size: 1.4em;
      line-height: 40px;
      -webkit-font-smoothing: antialiased;
      position: absolute;
      color: #000;
      text-align: center;
      left: 20%;
      top: 0;
      margin: 0 0 0 -25px;
    }
    .box > li .myContent {
      margin: 0 0 15px 25%;
      color: #000;
      padding: 2em;
      font-size: 1.2em;
      font-weight: 300;
      line-height: 1.4;
      position: relative;
      border-radius: 5px;
    }
    .box > li .myContent h2 {
      margin-top: 0px;
      padding: 0 0 10px 0;
      border-bottom: 1px solid rgba(255,255,255,0.4);
    }
    
  </style>
</head>
<body>
    <div style="width: 500px;">
        <div class="main">
            <ul class="box">
              <li>
                <div class="SerialNumber">1</div>
                <div class="myContent">
                  <h2>我是标题一</h2>
                  <p>我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、</p>
                </div>
              </li>
              <li>
                <div class="SerialNumber">2</div>
                <div class="myContent">
                  <h2>我是标题二</h2>
                  <p>我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、我是内容、</p>
                </div>
              </li>
             
            </ul>
          </div>
    </div>
</body>
</html>
css 实现时间轴 节点

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css 实现时间轴节点
