So this is my code:
.fb1c {
width: 100%;
height: 80%;
background: repeating-linear-gradient(
90deg,
var(–building-color4),
var(–building-color4) 10%,
transparent 10%,
transparent 15%
),repeating-linear-gradient(
var(–building-color4)0%,
var(–building-color4)10%,
var(window-color4)10%,
var(window-color4)90%,
)
}
And the error is "You should not alter the first repeating-linear-gradient ".
I did change a few things this and that in those 2 repearing linear but it still error.
Can someone explain it to me?
Thank you
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Oh yeah, I forgot to put the instruction:
You can add multiple gradients to an element by separating them with a comma (,) like this:
gradient1(
colors
),
gradient2(
colors
);
Add a repeating-linear-gradient to .fb1c below the one that’s there; use your --building-color4 from 0% to 10% and --window-color4 from 10% and 90%. This will fill in behind the gradient you added last.
Sorry ! Now I found the error, the error was var(window-color4)
but now I changed it to var(–window-color4) now the error is: You should use a second color of --window-color4 from 10% to 90%
and this is my new code:
.fb1c {
width: 100%;
height: 80%;
background: repeating-linear-gradient(
90deg,
var(–building-color4),
var(–building-color4) 10%,
transparent 10%,
transparent 15%
),
repeating-linear-gradient(
var(–building-color4),
var(–building-color4)10%
var(–window-color4)10%,
var(–window-color4)90%,
)
}
Congratulations on finding the error.
Great job of sticking with it while waiting! 
Happy coding!
now i’m stuck in the new error with the same step,
the error is:
You should use a second color of --window-color4 from 10% to 90%
can you give me hint about this error?
@rwahyu21x Are you able to post your updated code using < /> Preformatted so we can find the issue for you?
It may be something as small as a ; behind the final color brackets.
this is the code:
.fb1c {
width: 100%;
height: 80%;
background: repeating-linear-gradient(
90deg,
var(–building-color4),
var(–building-color4) 10%,
transparent 10%,
transparent 15%
),
repeating-linear-gradient(
var(–building-color4),
var(–building-color4)10%
var(–window-color4) 10%,
var(–window-color4) 90%
var(–window-color4) 90%
)
}
so it should be like this ?
.fb1c {
width: 100%;
height: 80%;
background: repeating-linear-gradient(
90deg,
var(–building-color4),
var(–building-color4) 10%,
transparent 10%,
transparent 15%
),
repeating-linear-gradient(
var(–building-color4),
var(–building-color4)10%
var(–window-color4) 10%,
var(–window-color4) 90%
)
}
and it’s still error with the same error
and i’m sorry that was my mistake
it’s still error
with that code 
OMG nevermind i found it, i forgot to put the comma after 10%.
thank you so much for helping me this far !
have a good day !