Content doesn't fill the screen

The content doesn’t fill the screen. It was ok before, saved and closed everything, opened again and now this is happening. Took a screenshot in case it’s only on my computer, but I tried in two different browsers.
This is the link to my project:

Looks like a bug on codepen. It’s the same when I open my own works (in full view).

Ok thank you so I guess I just have to wait.