[Gnome] Marble Dark Nord

Added margin / padding to the .panel class in the gnome theme CSS file. It's one of my go-to changes when theming gnome.

It's partly custom, I'll share my configs when I get home tomorrow. But mostly it's based on Marble-Grey-Dark

Here, my customized theme: https://drive.google.com/file/d/1uVXPP1s9acPTfOLBu33-fYX_AQaN_vX9/view?usp=sharing

I've also put my wallpaper in there :D

Mentioned the countdown in another reply, the cat is an extension called Runcat that shows CPU usage. I had XMRig running while taking this screenshot.

Until I die based on my current age and my country's life expectancy. I think the gnome extension is called Momento Mori or something

Thanks :D