Fix display issues on wide screen

[LesnyRumcajs]

On my 3440x1440 (21:9) screen the website displays weirdly:

• Some elements are aligned to the left, some are centered,
• the transition seems off, given it is only partially done when scrolling

The footer is image is cut in half

[conveyGhost]

Hello.
I m a blockchain and frontend developer.
I read your issue. and in case of large breakpoint, we might need set a container element (for restricting max-width)
or might need to introduce rem for main unit (basically it might need to be based on viewpoint)

I would be grateful if you take account of my opinion.
if Needed, I would like to fix it.

[conveyGhost]

#34
I made new PR for that.
pls check it.
thank you