Loading Screen bugs ?

Hello guys!
I worked on a simple loading screen for my server, it works
in my browser and on other devices. But when I set it
in GarrysMod as the loading screen it ruins the whole site.

Here is my loading screen URL: http://api.galaxygaming.de/index.php
And here is it how it looks ingame: http://prntscr.com/haz9sm

What should I do ?

We can’t access your loading screen. The web component displaying your loading screen is outdated by quite some time so that may be why your loading screen doesn’t display properly (missing features for example)

I removed cache from gmod, so it looks different now and better.
But It seems like the grid system doesnt work properly…

New screen attached: https://prnt.sc/haz9sm