网页滚动超出了body和html标签

I'd like to know why I'm getting a huge empty space on this website under the footer: http://bigweb.uy/stanford/ .. The weird thing is that it goes beyond the html tag. I'm experienced and I don't use any fixed height for containers nor huge margins that may have caused this issue. This happens only on big screens. Do you know any css trick to make the overflow-y work properly on this website ?

Thank you all

I was able to solve the problem by removing the "position:absolute" from the .tab-panel element. I have no clue why this was causing my problem , but I was finally able to solve it that way. Thank you all for your time !