Xah Lee, 2007-03
In old HTML (HTML 3), there's a “center” tag for centering:
<center><p>hi</p></center>
In HTML4 transitional, you can use CSS with align="center".
Here's the CSS code:
<div style="margin-left: auto; margin-right: auto; text-align:center;">I'M IN CENTER</div>
In summary, use text-align:center to center a text inside a tag.
Use margin-left:auto; margin-right:auto; to center a block level tag.