Tell us what’s happening: no idea why I am getting this error. You should give the repeating-linear-gradient a first color of --building-color2 from 0% to 5% .
Your code so far
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Challenge: Learn CSS Variables by Building a City Skyline - Step 104
Ok, you’re gonna need two of each color. It needs to know what color is starting at the percentage you give it, separately. You also don’t need to put in the 0%. It assumes that’s where you’re gonna start, like so:
background : repeating-linear-gradient( blue, black 20%, blue 30%, black 55%);