If you need a text that is indented from both sides of web page you can use <BLOCKQUOTE> tag.
Text that is enclosed in this tag will have a margin from left and right of your web page.
Example:
<HTML>
<HEAD>
<TITLE>Example</TITLE>
</HEAD>
<BODY>We see block quotes here:<BR><BR>
<BLOCKQUOTE>
In cases that you want to emphasis on a paragraph in your
text you can use this tag. It will indent your text from
both sides.
</BLOCKQUOTE>
</BODY>
</HTML>