css3响应式表格

<h1>极客学院相关课程</h1>
<table class="responsive">
    <thead>
        <tr>
            <th>课程序号</th>
            <th>课程名称</th>
            <th>课程操作</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td class="number">150406</td>
            <td class="name">移动应用开发课程</td>
            <td class="actions">
                <a href="#">修改</a><a href="del">删除</a>
            </td>
        </tr>
        <tr>
            <td class="number">150406</td>
            <td class="name">移动应用开发课程</td>
            <td class="actions">
                <a href="#">修改</a><a href="del">删除</a>
            </td>
        </tr>
        <tr>
            <td class="number">150406</td>
            <td class="name">移动应用开发课程</td>
            <td class="actions">
                <a href="#">修改</a><a href="del">删除</a>
            </td>
        </tr>
    </tbody>
</table>

h1{
font-size: 30px;
text-align: center;
color:#666666 ;
}
table.responsive{
 98%;
margin: 0 auto;
border: 1px solid #666666;
border-collapse:collapse;
box-shadow: 0 0 10px 0 rgba(0,0,0,5);
}
table.responsive th,table.responsive td{
border: 1px solid #666666;
padding: .5em 1em;
}
/*设置表头背景色*/
table.responsive th{
background-color: #35B558;
}
/*设置连接颜色*/
table.responsive .actions a{
color: #ff5c00;
text-decoration: none;
padding: 0 4px;
}
/*设置表格内容为居中对齐*/
table.responsive .number,table.responsive .actions{
text-align: center;
}

@media(max-480px){
table.responsive{
box-shadow: none;
border:none;
}
table.responsive thead{
display: none;
}
/*把所有的tr,td进行块状分布*/
 table.responsive tr,table.responsive td{
display: block;
border: none;
position: relative;
}
table.responsive tr{
margin-bottom: 1em;
box-shadow: 0 1px 10px 0 rgba(0,0,0,.2);
}
table.responsive .number{
text-align: left;
padding-left: 28%;
background-color: #35B558;
}
table.responsive .number::before{
content: "课程序号";
position: absolute;
left: .5em;
top:.5em;
font-weight: bold;
}
table.responsive .name{
text-align: left;
padding-left: 28%;
}
table.responsive .name::before{
content: "课程名称";
position: absolute;
left: .5em;
top:.5em;
font-weight: bold;
}
table.responsive .actions{
text-align: left;
padding-left: 28%;
}
table.responsive .actions::before{
content: "课程操作";
position: absolute;
left: .5em;
top:.5em;
font-weight: bold;
}
}