Learn CSS Variables by Building a City Skyline - Step 51

i dont know where is the missing part

Challenge: Learn CSS Variables by Building a City Skyline - Step 51

Link to the challenge:

Please post your actual code instead of a picture. Thanks

look very closely at the example they give you…
Notice how the first color is specified on two lines? (once with 0% and another with 40%?)
Why do you think they do that?

Edit: looks like you found my last response on this topic. Hopefully it will help you.