Here are a few concept. Bits of code that could be usefull for beginners. things I often use to save time. Head's up I didn't change the fonts in all the css files so you may have to download them from googlefonts

Like this nice sidebar. Copy/paste and see how you can have fun with it. a simpler very that you can modify yourself

a website made entirely of closed section could be cool:

Here are login Concepts

A small Search bar

A small glasseffect could be very nice! There are any filter available in the css. try to explore.

Grid is alway a powerful tool to use in css. I learn this from Kevin Powell here's his site. https://www.kevinpowell.co/