<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
table, th, td{
border: 1px solid #8c8c8c;
border-collapse: collapse;
}
</style>
</head>
<body>
<table>
<tr>
<th id="gender" colspan="2">Gender</th>
</tr>
<tr>
<th headers="gender">Male</th>
<th headers="gender">Female</th>
</tr>
<tr>
<td>Alex</td>
<td>Alisa</td>
</tr>
</table>
</body>
</html>