<!DOCTYPE html>
<html>
    <head>
        <style>
            body { zoom: 1.5; }
            #head { height: 35px; }
            table { background: red; margin-top: 25px; }
            td { background: white; }
        </style>
    </head>
    <body>
        <table cellpadding="0" cellspacing="0" width="100%">
            <tr>
                <td style="height:21px">first row</td>
            </tr>
            <tr>
                <td>second row</td>
            </tr>
        </table>
        There should be no red line between the rows.
    </body>
</html>