JSFiddle - React, Tailwind, and code Playground
HTML
<div id="mydiv">
<table>
<tbody>
<tr>
<td>Your name:</td>
<td><input class="required" id="entry_0" name="entry.0.single" type="text" value="" /></td>
</tr>
<tr>
<td>Your email:</td>
<td><input class="required email" id="entry_1" name="entry.1.single" type="text" value="" /></td>
</tr>
<tr>
<td>Subject:</td>
<td><input class="required" id="entry_3" name="entry.3.single" type="text" value="" /></td>
</tr>
<tr>
<td>Message:</td>
<td><textarea class="required" cols="60" id="entry_2" name="entry.2.single" rows="17"></textarea></td>
</tr>
<tr><td coslpan="2"></td></tr>
<tr align="center">
<td colspan="2"><input name="submit" id="submit" type="submit" value="Submit"/>
</td>
</tr>
</tbody>
</table>
</div>
CSS
#mydiv {
margin-left: auto;
margin-right: auto;
width: auto;
margin-top: 100px;
border: 1px solid #CCC;
border-radius: 4px;
-moz-border-radius: 4px;
-webkit-border-radius: 4px;
}