Learn CSS Variables by Building a City Skyline - Step 60

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%

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thanks #igorgetmeabrain.
i have finally figured it out.