Fill in .bb3 with a repeating-linear-gradient . Use 90deg for the direction, your building-color3 for the first two colors, and window-color3 at 15% for the third. When you don’t specify a distance for a color, it will use the values that makes sense. In this case, the first two colors will default to 0% and 7.5% because it starts at 0% , and 7.5% is half of the 15% .
I think you should double-check your CSS variable names.
If you can’t spot any mistakes, please post a link to the challenge as well as your full code, with 3 back-ticks before and after your code to format it.
You can also format your code using the </> “preformatted text” button.
For future reference - when you want to post a question in the forum, you can do that by clicking the Ask for Help button located on the challenge.
That will create a new topic with all your code and it also includes a link to the challenge.
You’ll still be able to ask your question in the post before submitting it to the forum.