Code Tags

For some reason, my code tags aren’t working correctly. Anytime I use them on a snippet of code, the code is actually executed inside of it rather than being displayed.

For example:

<code><div style="background:red;">Stuff</div></code>

This should display in the post like this:

<div style="background:red;">Stuff</div>

But instead it shows up like:

Stuff
(with a red background)

What should I do to fix this?

Thanks.