html-作业
<html>
<head>
<meta charset="UTF-8">
<title>html</title>
<style>
th{background-color:yellowgreen;}
td{
text-align:center;
background-color:pink;
}
</style>
</head>
<body>
<table style="border-style:none;width:50%;" border="1">
<tr>
<th colspan="5">表頭</th>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
</tr>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
</tr>
</tr>
<tr>
<td>1</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
</tr>
</table>
</body>
</html>