Content Flow in Firefox

In reference to http://www.christophercreations.net/index.php .
I have modified the default theme to my needs and to conform to my site’s design. One problem I am experiencing (only on the main wp page) is that the post content is not staying within the #page container when viewed in Firefox. In IE, it is fine. I am using the following CSS:
min-height: 400px;
height: auto !important;
height: 400px;

I tried removing that last height comment, but that did not help either. Any help with this problem would be great!

Thanks in advance.