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Image sizing/overflow within div

hi - i’m running into what i would assume is a fairly simple issue (i’m a newb). essentially, i’m trying to create tiles with images (4 images evenly distributed within tiles) - where the images are larger than the parent div block that it sits within. so that it you only see a portion of the image, and the div wrapper cuts off the overflow. is there anyone who can point me in the right direction?

ultimately, i would like to create a version of this project, but instead of color tiles, they would be portions of a static image:


Here is my site Read-Only: