How to target a recurring topic with CSS

Hi Guys,

I’ve got a weekly community event going on where we celebrate the best :poop: posts. The format visually is as follows:


The images are 120x360 which are fine on desktop. For mobile though they need scaling to 50% and then they work mostly fine too.

I read that CSS can’t pick out tagged content so was wondering how to pick these topics out that I’m naive to or if that’s not how I ought to be doing I’ll gladly take any education on it! Thanks.