```html
<style>
th{
border: 1px solid red;
width: 100px;
height: 100px;
}
td{
border: 1px solid red;
height: 100px;
width: 100px;
}
.box1{
border: 1px solid red;
width: 100px;
height: 100px;
margin-top: 10px;
}
</style>
</head>
<body>
<table border="1" cellspacing="0">
<tr>
<th>姓名</th>
<th>班级</th>
<th>年龄</th>
</tr>
<tr>
<td>小李</td>
<td>高一</td>
<td>16</td>
</tr>
<tr>
<td>小王</td>
<td>高二</td>
<td>17</td>
</tr>
</table>
<div class="box1">
</div>
</body>
</html>
``表格的边框设置为1 但是cellspacing=0 但是表格的边框并不是为1啊
怎么设置表格的边框为1呢？并且怎么同时给th td 设置样式呢？ 尤其是cellspacing和cellpadding怎么在css里面写呢？
