Learn CSS Variables by Building a City Skyline - Step 23

HTML-CSS
1 
.bb2 {
  width: 10%;
  height: 50%;
  background-color: var(--variable-name, green);
}
``

I can't seem to get beyond this stage and it keeps saying "You should add a fallback value of green to the background-color property". What am I doing wrong?
2

Check you variable value,it does not match the instructions.

3

thanks a lot, I got it

4

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