Feedback on Product Landing page

Hello, World!
I’ve just finished my product landing page. It’s based off the Portal universe, in case you couldn’t guess. (It’s not exactly subtle)
Anyway, here’s the link: https://codepen.io/aviage-01/pen/qKMNaz?editors=1100
Thanks!

I thought that they were centered, because I set the main element to centered. If they aren’t centered, how would I center them?

Also, I tried to use the margin and padding, but it didn’t seem to make a difference. I have got very slow internet, which often messes up the page, so maybe that’s the problem…

Thanks! That does look better!