Getting images to fit their container card fully

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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