The first kind of

Expected effect:

<! doctypehtml>
<html>

<head>
  <meta charset="utf-8">
  <title>Product character layout</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    body {
      overflow: hidden;
    }
    div {
      margin: auto 0;
      width: 100px;
      height: 100px;
      background: red;
      font-size: 40px;
      line-height: 100px;
      color: #fff;
      text-align: center;
    }

    .div1 {
      margin: 100px auto 0;
    }

    .div2 {
      margin-left: 50%;
      background: green;
      float: left;
      transform: translateX(-100%);
    }

    .div3 {
      background: blue;
      float: left;
      transform: translateX(-100%);
    }
  </style>
</head>

<body>
  <div class="div1">1</div>
  <div class="div2">2</div>
  <div class="div3">3</div>
</body>

</html>

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Second (full screen version)

The desired effect

<! doctypehtml>
<html>
  <head>
    <meta charset="utf-8">
    <title>Product character layout</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      div {
        width: 100%;
        height: 100px;
        background: red;
        font-size: 40px;
        line-height: 100px;
        color: #fff;
        text-align: center;
      }

      .div1 {
        margin: 0 auto 0;
      }

      .div2 {
        background: green;
        float: left;
        width: 50%;
      }

      .div3 {
        background: blue;
        float: left;
        width: 50%;
      }
    </style>
  </head>

  <body>
    <div class="div1">1</div>
    <div class="div2">2</div>
    <div class="div3">3</div>
  </body>
</html>
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