Time tracking dashboard (w/ tablet view)

This is the first non-Newbie-level challenge I've done; I think it turned out pretty good! Any feedback appreciated!

I wanted to do a slide in animation for the cards, but I found out that it tends to break elements that use z-indexing. Since my implementation for the two-layer cards uses a pseudo element with z-indexing, I wasn't able to figure out how to get it to work. If anyone has any solutions, I'd greatly appreciate hearing them.