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<!DOCTYPE html>
<html>
<style>
table, th, td {
border:1px solid black;
border-collapse: collapse;
}
</style>
<body>
<h2>Set the height of the second row to 200 pixels</h2>
<table style="width:100%">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Age</th>
</tr>
<tr style="height:200px">
<td>Jill</td>
<td>Smith</td>
<td>50</td>
</tr>
<tr>
<td>Eve</td>
<td>Jackson</td>
<td>94</td>
</tr>
<tr>
<td>John</td>
<td>Doe</td>
<td>80</td>
</tr>
</table>
</body>
</html>
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<div id="mainHolder" style="overflow: auto; max-height: 400px;">
<table>
Lots of data
</table>
</div>