I'm stuck in this step,what's mean circle closet corner?

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Challenge: Step 113

Link to the challenge:

if you’re totally clueless about what radial-gradient() is, then i would suggest you look into this mdn article, that should actually tell you what it really is

and to pass this test, it actually telling you in instructions what needs to be done, just add that in beginning of ‘.sky’ css rules and dont forget to add a ‘comma’ after that, then it should be fine :slight_smile: