Browser compatibility (IE issue) with Upfront theme

Hi Im having a problem with a site im configuring based on the spirit theme. If I access it with chrome o firefox it looks fine. Even in mobile browser (chrome).

With Internet Explorer the background video is covering the top subregion and the button to scroll down. How can I fix that?
I'm using IE 11 (11.0.9600.17691) (11.0.17)
The link is:

Best regards,