HTML/CSS/Basic Tags/center
"center" centers content between the margins of a page, table, or other object
<html>
<head>
<title>center element example</title>
</head>
<body>
<center>
<table width="400" border="8" cellspacing="5" cellpadding="5" align="center">
<caption valign="bottom" style="color:blue">
This table is centered within the margins of the page.
</caption>
<tr>
<td>not centered</td>
<td><center>centered</center></td>
</tr>
<tr>
<td><center>centered</center></td>
<td>not centered</td>
</tr>
</table>
</center>
<center>Centered</center>
<br>
not centered
</body>
</html>