Recently I discovered a great website to exercise my CSS skills in a different way daily. CSSBattle offers every day a different "target", a design you should make as close as possible with CSS. I highly recommend it cause it helps me to get more familiar with CSS proprieties like margin, padding, display, and more.
Would you like to join and/or share your results with me? I'm always looking for new ways of doing the target cause sometimes I think I did it the hard way.