css style not working with IE …

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!

https://wordpress.org/plugins/recent-posts-widget-extended/