SOURCE

<table width="80%" border="1">
	<thead>
		<tr>
			<th>姓名</th>
			<th>年龄</th>
			<th>出生年月</th>
			<th>手机号码</th>
			<th>单位</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td>张三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张三封</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴与四十大盗</td>
		</tr>
		<tr>
			<td>张小三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>腾讯科技</td>
		</tr>
		<tr>
			<td>张三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>浏阳河就业</td>
		</tr>
		<tr>
			<td>张三疯子</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张大三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张三五</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张刘三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
		<tr>
			<td>张三</td>
			<td>18</td>
			<td>1990-9-9</td>
			<td>13682299090</td>
			<td>阿里巴巴</td>
		</tr>
	</tbody>
</table>

table tbody {
    display: block;
    height: 195px;
    overflow-y: scroll;
}

table thead,
tbody tr {
    display: table;
    width: 100%;
    table-layout: fixed;
}

table thead {
    width: calc(100% - 1em)
}

table thead th {
    background: #ccc;
}