Add object-fit class to thumbnail images

[BraydenTW]

Hey Savio,

Neat app! I noticed that the thumbnails for the cheat sheet items were stretched:

This can be solved using the same <img> element by adding the Tailwind class: object-cover. It will apply this CSS rule to it: object-fit: cover; (it functions like background-size: cover; on a <div> element).

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