如何用CSS调整表格边框之间的间距
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>border-spacing属性</title>
<style>
table, th, td {
border: 2px solid #3E8F3E;
text-align: center;
}
#demo {
border-collapse: separate;
background-color: none;
border-spacing: 20px 40px;
}
h2 {
color: green;
}
</style>
</head>
<body>
<center>
<h2>border-spacing属性</h2>
<h3>border-spacing: 20px 40px;</h3>
<table style="width:70%" id="demo">
<tr>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
</tr>
<tr>
<td>晓华</td>
<td>15</td>
<td>女</td>
</tr>
<tr>
<td>天健</td>
<td>27</td>
<td>男</td>
</tr>
<tr>
<td>邓琴</td>
<td>28</td>
<td>女</td>
</tr>
</table>
</center>
</body>
</html>