This page looks good in chrome en firefox, but with IE it

Hi,

This page looks good in chrome en firefox, but with IE it comes with some extra lines.
http://www.stjandedoper-vechtenvenen.nl/vluchteluingenwerk-stichtse-vecht/

I think it comes from the widget at the left sidebar.
The code I am using is this:

.actueel-sidebar.rpwe-block li{
border-bottom: none!important; /*1px solid #eee;*/
margin-bottom: 10px;
padding-bottom: 10px;
list-style-type: none;
}

What should I use to make it looks good also with IE?

Thanks!