incorrect test result - prevents the transition to the next lesson

You have a second declaration of background-color
. The default “green” color is not the same color as hsl(120, 100%, 50%)
. In css, when you provide multiple rules, the last one will be selected. (The “C” in CSS is “cascading” and relates to how rule precedence works).
All of your classes should only have one background-color
each.