I just tried to do the CSS thing again but it was a huge failure. I literally only tried to change the color of a small thing like the header but it ended up turning my whole page to the default thing.

This CSS thing sucks I officially give up for a while,

I've been trying to customize my thing for the past two hours. I even searched up some generators to get an idea of what I should type but nothing is working :,))

I also watched " MY SPACE FOR DUMMIES " but I didn't learn anything.

Please help !