Problem with fluid div

I have a fluid layout I believe. http://www.puddypaws.co.uk/appeals.html but the page is not expanding with the rest of the inner box.

I cant figure out why, is it because of the short content I dont know? I really dont know what I am doing with fluid layouts but they are better for standards, so want to do them.

appreciate anyones help with this

Hello quartzy,
Do you mean your #main_textarea?

For float to work you need to give it a width.
If you want #main_textarea to be full width, why float it? We float things to put other things beside them.

Does this help?
#main_textarea {
/*float:left;*/
position: relative;
margin: 0;
padding: 0;
}

That is brilliant, it all works I never thought that adding float would cause such a problem. Thanks so much.