Not sure what's wrong with the webpage

On my pc the website loads correctly, but on my macbook pro the website is viewed skewed. Notice the circles and my background photo. I'm not sure what's causing this honestly as I don't know an incredible amount about scripts. Hopefully an admin can help me out so I can view this forum correctly.

Attached Photo:

Kimizuki wrote

ewwwwww.........a mac.......

Says the kid who has never owned one...  :sigh:

Hex wrote

Guts wrote

Says the kid who has never owned one...  :sigh:

Calling people "kids" in 2016.

Sorry I'm old, anyone born in the 2000's is a kid imo

Aiba wrote

Its actually the CSS I used thats causing this on smaller screens. Thanks for reporting this, ill make a better profile page... again.

If you just got rid of the circles for posts and threads, couldn't the crisis be kind of sorted out?