Footer widgets being displayed differently in Chrome and Firefox/IE

Hi,

I had to make some adjustments to my new themes homepage (CSS overriding) to make it look the same in different browsers (still not 100%, but it’s ok for now).

The last part I’m stuck on though is its footer. I installed 4 widgets (not finished yet), but as you can see at the link below, Chrome shows the widgets properly, but Firefox sets it off a bit to the right.

I can’t seem to find a way to fix it (with CSS). Hopefully anyone out here can? Thanks so much!

Link: https://bit.ly/1LzXJp7

P.S. I already tried to remove all override CSS code, but that doesn’t change anything at all.