I think your CSS is OK, (I am not an expert at CSS but I am currently learning it myself).
I think you issue is a cerficate error on the page you are hosting
try this:
body {background-image: url("https://image.shutterstock.com/image-vector/sample-stamp-grunge-texture-vector-600w-1389188336.jpg"); background-size:cover;}
I tested it in the additional CSS on my page and it worked.
I also added it to my stylesheet in my child theme and that also worked.
Hope that helps!
Cheers.
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