Insert HTML Code in Posts

Hi Guys, I’m fairly new to wordpress and I am trying to insert some html code in one of my posts and it is not working. I am using the “code view” editor and the tags. The HTML code is displaying out of the “code” box just like regular HTML code.

The Address is http://www.cssmarvels.com and the problem is there for you to see.

I inserted CSS code doing that and it worked, but not with HTML. Does anybody have any idea what the problem is???

Thanks!