Is it bug? or am I doing something wrong

Question: add a background property below the background-color property. Set it as a gradient of type linear-gradient that uses --building-color1 as the first color and --window-color1 as the second.
What I Have Done: .bb1a {
width: 70%;
height: 10%;
background-color: var(–building-color1);
background: linear-gradient(–building-color1, --window-color1);
Now: why is it showing me incorrect?

Welcome to the community :smiley:

If you try a step three times a ‘help’ button will appear:

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Its hard to see your code in this form, due to it getting mangled by the browser. To include code in a post, use 3 back tics before AND after your code block.
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The browser will mangal code if no back tics are used, this makes it harder for people to help.

to answer your question, the var() function to get value from css variables, you are not using it