Mobile First Four Card Solution | Using CSS Grid

Solution retrospective
Hi! I'm still confused when is right time to use px, em, or rem, so I'm mostly use rem for the length value, is that the right thing to do?.
And any suggestion on the other CSS technologies that I can use for this challenge?
I'm new to the front end development, I don't know if this is the best approach to this challenge, so a feedback would meant a lot to me.
Thanks!
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