Vaadin Style Sheet in IE Edge

Hi,

I have Problems in IE Edge. Everything is fine with Firefox and Chrome. But if I open my website in IE it looks strange. For example, I use a HorizontalLayout for my Footer, but the Footer shows all items in a vertical order. No Layout is at his right position. For me it looks like the Vaadin Style Sheet was not loaded correctly.

Is there something I could check or test?

Thanks