CSS实例：图片导航块

  1. 认识CSS的 盒子模型。
  2. CSS选择器的灵活使用。
  3. 实例:
    1. 图片文字用div等元素布局形成HTML文件。
    2. 新建相应CSS文件，并link到html文件中。
    3. CSS文件中定义样式
      1. div.img：border,margin,width,float
      2. div.img img：width，height
      3. div.desc：text-align,padding
      4. div.img:hover：border
      5. div.clearfloat：clear 
        <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>img</title>
    <link rel="stylesheet" type="text/css" href="static/css/20.css">
</head>
<body>
<div class="recommend">
    <div class="img">
        <a  href="http://www.gzcc.cn"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501835&di=ee39b28ecbf99c25f74d58d9ffe82324&imgtype=0&src=http%3A%2F%2Fimg15.3lian.com%2F2015%2Fa1%2F17%2Fd%2F103.jpg"></a>
        <div class="desc"><a href="http://www.gzcc.cn">校园风光</a></div>
</div>
    <div class="img">
        <a href="http://www.gzcc.cn"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501837&di=b38f6bdf60876058de40ffeccf9594a2&imgtype=0&src=http%3A%2F%2Fimage82.360doc.com%2FDownloadImg%2F2015%2F02%2F1702%2F50258430_3.jpg" ></a>
        <div class="desc"><a href="http://www.gzcc.cn">校友风采</a></div>
    </div>
    <div class="img">
        <a href="http://www.gzcc.cn"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501834&di=08e20a1a9a471027dd2aebfaa10e174a&imgtype=0&src=http%3A%2F%2Fimg0.ph.126.net%2Fq56WqeGz-DIkd2j_KfgERA%3D%3D%2F6599319367447546437.jpg" ></a>
        <div class="desc"><a href="http://www.gzcc.cn">学校文化</a></div>
    </div>
</div>
<div class="clearfloat">
    <a href="http://www.gzcc.cn"><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501837&di=b38f6bdf60876058de40ffeccf9594a2&imgtype=0&src=http%3A%2F%2Fimage82.360doc.com%2FDownloadImg%2F2015%2F02%2F1702%2F50258430_3.jpg" alt="4"></a><br>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501837&di=cbcfba0d0f86734c5f58d3a308652e41&imgtype=0&src=http%3A%2F%2Fimage13-c.poco.cn%2Fmypoco%2Fmyphoto%2F20120603%2F10%2F44921306201206031053543978391258438_003.jpg" ><br>
    <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508470501836&di=a88a803aa561194b736956cd90a58b87&imgtype=0&src=http%3A%2F%2Fimg17.3lian.com%2Fd%2Ffile%2F201701%2F05%2F053489996fcb1584914fff107651c81f.jpg" ><br>
</div>
</body>
</html>>
        img{
             300px;
        }
div.img{
     border: 1px solid #ccc;
      180px;
    height: 180px;
     float: left;
     margin: 5px;
 }
div.img img{
     100%;
    height: auto;
}
div.desc{
    text-align: center;
    padding: 5px;
}
div.img:hover{
    border: 1px solid red;
}
div.clearfloat{
    clear: both;
}

        clearfloat：clear
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原文地址：https://www.cnblogs.com/chenhuafei/p/7698310.html