DIV Won't Clear Except in Chrome - Wordpress Issue

[cmcconnell]

Here's the site I'm having problems with -- www.outlookmag.org -- if you can fix this, you are guaranteed to get good feedback!

Specific problem: The grey box around the group of small 125x125 sidebar ads on the righthand side of the site is not clearing to contain the ads EXCEPT in Chrome. This should be easy enough to fix, but, since I am using Wordpress, I am not sure how to add any code to the actual text widget Div itself. I tried clearing with a </br>, which is what is working in Chrome, but not anywhere else.

Any ideas on how to fix??

[teedoff]

You cant edit the stylesheet?

If so, overflow: auto; works

.widget_text .textwidget {
    background: none repeat scroll 0 0 #F3F3F3;
    border: 1px solid #DFDFDF;
    overflow: auto;    
    padding-bottom: 8px;
    padding-left: 18px;
    padding-top: 18px;
}