https://www.codecademy.com/en/courses/make-a-website/lessons/closer-look-css/exercises/background-image
I'm not actually stuck on the exercise, but I am having trouble applying this lesson outside CodeAcademy. I am making my own (VERY simple) website using Atom. I tried to recreate this to use a background image, but it doesn't work when I use the .hero class selector. And when I put the background-image and background-size bits in body{}, it covers everything else on the page. Help?
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