Creating images from scratch

Hey everyone, I came across some illustrations that were done in html and css (I’m assuming html5 and css3). Has anyone else seen these illustrations before? They weren’t done in a canvas just multiple divs. Anyways, would anyone happen to know of any tutorials and could help me get on the right track, maybe something that might explain the code as well? Thanks for any help.

I think you may be referring to CSS shapes techniques.

hope that helps.