Floating Group getting off page (going f'ing crazy)

I’m building my first web app and I’m doing the “front-end” on first place.

I want to make kind of a side floating menu and I’m going crazy with this.
I’ll leave the images here of whats happening.
Please someone help me, I’ve tried already something I found here on other similar thread (pasting a css code making a bumper group) but it isn’t working!

Sorry if this Is written in a confused but I am fried.

It appears your content is inside a Group/container that restricts its width.