Why does the site look like I'm on mobile?

I'm at work, using the same browser on the same computer that I always do, and the site's layout looks like it's the mobile version. Also, I looked for any option at the bottom to switch back and forth and I don't see anything. Was there a site revamp today or something?

EDIT: Weird, I got back on from my home computer and now it looks normal.

Your browser zoom was probably set too high or your window was too small.