Some topics in CSS are more easier to understand by experience then they are by reading docs/blogs. Here are some games that helped me understand these topics better:

CSS

• CSS Challenges - https://css-challenges.com/

• CSS Speedrun - https://css-speedrun.netlify.app/

Selectors

• CSS Diner - https://flukeout.github.io/

Flexbox

• Flexbox Froggy - https://flexboxfroggy.com/

• Flexbox Defense - http://www.flexboxdefense.com/

• Flexbox Zombies - https://mastery.games/flexboxzombies/

• Flexbox Adventure - https://codingfantasy.com/games/flexboxadventure

Grid

• Grid Garden - https://cssgridgarden.com/

• Grid Critters - https://mastery.games/gridcritters/

• Grid Attack - https://codingfantasy.com/games/css-grid-attack

Anchor

• Anchoreum - https://anchoreum.com/

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Testing yourself

Here are some websites where you can test your skills against other people around the world or your friends:

• CSS Battle - https://cssbattle.dev/

• Coding Game - https://www.codingame.com/start/