HTML table cell goes down when add text -

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i have table this:

<table class="rds" cellspacing="15px">     <tr>         <td id="r1"><a id="rx1" href="#"></a></td>         <td id="r2"><a id="rx2" href="#"></a></td>         <td id="r3"><a id="rx3" href="#"></a></td>         <td id="r4"><a id="rx4" href="#"></a></td>     </tr> </table>

and css file:

.rds {     width: auto;     margin-left:auto;     margin-right:auto; }  .rds tr td a:link, .rds tr td a:visited {     display: block;     width: 39px;     height: 39px;     background-image: url('images/bg.png');     background-repeat: no-repeat;     background-position: center; }  .rds tr td a:active, .rds tr td a:hover {     display: block;     width: 39px;     height: 39px;     background-image: url('images/bg.png');     background-repeat: no-repeat;     background-position: center;     opacity: 0.9; }

but when add text tags, cell goes down bit. cell text goes down.

what can do?

use vertical-align="top" on cells. in css 

td {     vertical-align:top; }

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