It is surprisingly difficult to make two things equally high in css (without putting height in pixels). Like two columns of a parent div. You can't use "height: 100%;" out of the box like you can with width.

Why though? I understand that height is more difficult that width. But the parent element has a height. Not by me, but the browser figures it out. So why can't something inside it be 100 % of it. Beats me.

Well at least it works now.