CSS3 flex布局-携程小测试demo效果：素材

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      list-style: none;
    }
    a {
      text-decoration: none;
      color: #333;
    }
    img {
      display: block;
      width: 100%;
    }

    /* 导航栏模块 */
    .nav .item {
      height: 90px;
      display: flex;
      background-color: deeppink;
      margin: 10px;
      border-radius: 15px;
    }
    .item .pub {
      flex: 1;
      border-right: 1px solid #fff;
    }
    .item .sub {
      flex: 2;
    }
    .sub a {
      width: 50%;
      float: left;
      text-align: center;
      line-height: 45px;
      border-right: 1px solid #fff;
      border-bottom: 1px solid #fff;
      /* 采用盒子内减模式 */
      box-sizing: border-box;
    }
    .item-more {
      height: 90px;
      background-color: deeppink;
      margin: 10px;
      border-radius: 15px;
    }
    .sub a {
      width: 33.333%;
    }
    .nav .item:nth-child(2) {
      background-color: mediumaquamarine;
    }
    .nav .item:nth-child(3) {
      background-color: yellowgreen;
    }
    .nav .item:nth-child(4) {
      background-color: orange;
    }

    /* 其他模块 */
    .extre {
      display: flex;
    }
    .extre a {
      flex: 1;
    }

    /* 底部导航 */
    .footer ul {
      display: flex;
      border-top: 1px solid #ccc;
      border-bottom: 1px solid #ccc;
    }
    .footer ul li {
      flex: 1;
      text-align: center;
      line-height: 50px;
    }
    .footer p {
      text-align: center;
      font-size: 12px;
      color: #999;
      line-height: 40px;
    }
  </style>
</head>
<body>
  <div class="layout">
    <!-- banner -->
    <div class="banner">
      <a href="#"><img src="DemoMaterial/练习/banner.jpg"></a>
    </div>
    <!-- 导航栏模块 -->
    <div class="nav">
      <div class="item">
        <div class="pub"></div>
        <div class="sub">
          <a href="javascript:;">海外酒店</a>
          <a href="javascript:;">团购</a>
          <a href="javascript:;">特惠酒店</a>
          <a href="javascript:;">客栈公寓</a>
        </div>
      </div>
      <div class="item">
        <div class="pub"></div>
        <div class="sub">
          <a href="javascript:;">海外酒店</a>
          <a href="javascript:;">团购</a>
          <a href="javascript:;">特惠酒店</a>
          <a href="javascript:;">客栈公寓</a>
        </div>
      </div>
      <div class="item">
        <div class="pub"></div>
        <div class="sub">
          <a href="javascript:;">海外酒店</a>
          <a href="javascript:;">团购</a>
          <a href="javascript:;">特惠酒店</a>
          <a href="javascript:;">客栈公寓</a>
        </div>
      </div>
      <div class="item-more">
        <div class="sub">
          <a href="javascript:;">海外酒店</a>
          <a href="javascript:;">团购</a>
          <a href="javascript:;">特惠酒店</a>
          <a href="javascript:;">客栈公寓</a>
          <a href="javascript:;">度假</a>
          <a href="javascript:;">免税店</a>
        </div>
      </div>
    </div>
    <!-- 其他模块 -->
    <div class="extre">
      <a href="#"><img src="DemoMaterial/练习/extra_1.png"></a>
      <a href="#"><img src="DemoMaterial/练习/extra_2.png"></a>
    </div>
    <!-- 底部导航 -->
    <div class="footer">
      <ul>
        <li>客户端</li>
        <li>关于</li>
        <li>联系我们</li>
      </ul>
      <p>网址地址 | ENGLISH | 电脑版</p>
      <p>@2020 携程旅行</p>
    </div>
  </div>
</body>
</html>
demo 效果：
素材