Link blocks over background video are not working

Hi All
I am trying to get my Facebook and Linked icons functioning when positioned over the background video. The BG video is placed first in the body then the logo tag and social media links have been drawn (- margin) up over the top of the video. The links work fine when they’re moved elsewhere. Just not sure what to even ask about really and If I don’t ask the right question chances are my answers won’t be what I need!

Thanks in advance everyone

Cheers Maggie

Here is my public share link: