How does a back end developer approach front end web pages?

Currently working and a student. Still learning about tons of new technologies and mainly trying to get my head around things.

I have worked with node and django for back end web things but once i get to the visual side of things my non-artistic self struggles. Is there any solid way to get into creating nice css and html layouts? even just for prototyping purposes at hackathons/for demo's ( i'd love to be able to write full apps not just the back end )