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Here's a nice ebook which will give you a feeling for what professional designers actually do. There are also links to sites for inspiration. This will give you a feel, for what is actually possible (crazy stuff out there).

https://design-process.netguru.co/chapters/01-project-introd...

Btw. if you want to trial&error your css theres this amazing online tool called jsfiddle. Theres a section for html css and javascript. If you do not need the javascript, just leave it empty.

Here's a simple example: https://jsfiddle.net/frq75sud/5/

Just edit the css and press ctrl+enter.