How to use linear gradient


i keep getting this after like a hundred triesđź’”
any help would be appreciated

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this is my code

.bb1a {
background: linear-gradient(
–building-color1,
–window-color1);
width: 70%;
height: 10%;
background-color: var(–building-color1);

}

i’m trying to add a linear background on .bb1a yet the code doesn’t pass

finally got it
for anyone who is going through the same here’s the code

Mod Edit: SOLUTION REMOVED