请问老师，字母没有下划线的问题

来源：4-3 编程练习

Coolyang_

2018-02-06 22:33:41

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>文本样式</title>
        <style type="text/css">
           /*写出CSS样式*/
            div{
               text-align:center;
               font-size:2em;
               background-color:#eee;
               line-height:5em;
           }
           img{vertical-align:-5px;}
           .one{
               font-size:2em;
           }
           .two{
               color:red;
               text-decoration:underline;
               vertical-align: 10px;
               text-transform:capitalize;
           }
        </style>
    </head>
    <body>
          <!--写出html代码-->
          <div>
          <img src="http://climg.mukewang.com/59c21bae000157fa01000059.jpg" alt="" />
          <span class="one">CSS层叠样式表</span><span class="two">(cascading style sheet)</span>
          </div>
    </body>
</html>