THIS IS A HARD ONE i have too many favorites....
a recent one i loved was @blackle's puzzle box which i was VERY impressed by: https://cohost.org/blackle/post/260204-div-style-width-60
css doom was also one of the first css crimes i remember, and that's why it's @BestOfCohost's first rechost: https://cohost.org/littleampton/post/539030-cohost-yeah-it-run
honorable mention to the css Witness puzzle because i had finished the game for the first time like a week before reading the post and the timing killed me: https://cohost.org/oatmealine/post/1567786-me-oh-boy-i-sure-a
and finally there's @berg's fidget pic which is the first fanart i got from cohost like 2 days after i signed up.... bless u berg: https://cohost.org/berg/post/506307-boop-the-red-panda-d
