Learn CSS Variables by Building a City Skyline - Step 112

It looks like I’m following the instructions in terms of placing the radial gradient in the background property of the .sky class in CSS. It’s still not passing:

.sky {
background: radial-gradient (
#ffcf33 0%,
#ffcf33 20%,
#ffff66 21%,
#bbeeff 100%
);
}

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Challenge: Learn CSS Variables by Building a City Skyline - Step 112

Link to the challenge:

You can’t have a space between the function name and the opening left parenthesis.

Thanks for your help it passed.