Getting images to fit their container card fully

https://preview.redd.it/g3c3eic3ot7d1.png?width=1796&format=png&auto=webp&s=803ef33acd07a91c92cebc4789660e7431688a65

https://preview.redd.it/zdkkmnr4ot7d1.png?width=990&format=png&auto=webp&s=f43bf87911d38d59908a6dae123c45bb83010226

https://preview.redd.it/psvngylgot7d1.png?width=1818&format=png&auto=webp&s=41e42306fa81f0d29a5039fed3ab5318953bc621

I’m trying to get the course images shown in the courses page to fit their containers more fully. Similar to what you see when you open up a specific course in the third image. I tried editing the css to change the images in their containers (shown in second image), but this doesn’t seem to be changing them. I should note that I am using the Jetpack plugin to edit css and the Omexo theme. Am I going about this wrong? Should I be changing the images used entirely?

 

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