If you want to include CSS inside a HTML tag, you can use the STYLE attribute as <TAG STYLE="css_definition" ...>. Of course, the CSS definition will only apply to this instance of this tag. The following tutorial exercise shows you how to set background to gray on a <PRE> tag:<p>Map of commonly used colors:</p><pre style="background-color: gray"> black #000000 white #ffffff gray #7f7f7f red #ff0000 green #00ff00 blue #0000ff</pre>