Css基本样式————综合设计：表格的制作

<table id="tb">
    <tr>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
    </tr>
    <tr>
        <td>小王</td>
        <td>20</td>
        <td>男</td>
    </tr>
    <tr class="alt">
        <td>小王</td>
        <td>20</td>
        <td>男</td>
    </tr>
    <tr>
        <td>小王</td>
        <td>20</td>
        <td>男</td>
    </tr>
    <tr class="alt">
        <td>小王</td>
        <td>20</td>
        <td>男</td>
    </tr>
</table>





#tb{
    border-collapse: collapse;
    width: 500px;
}
#tb td,#tb th{
    border: 1px solid bisque;
    padding: 5px;
}
#tb th{
    text-align: left;
    background-color: aqua;
    color: #ffffff;
}
#tb tr.alt td{
    color: black;
    background-color: aquamarine;
}