Internet Explorer 11 compatibility
Problem description
The web page is not displayed properly on Internet Explorer 11. I think we do not need to make every little bit perfectly fit to IE11, but at least the first impression should be fine.
Possible reasons
Internet Explorer 11 does not support --*: var()
(CanIUse). This might not be the only thing that needs to be made compatible, but it is definitely one of the issues.