Advanced Sass Concepts' code challenge

I can't figure this out, please help!

Challenge: Underneath the previous code, store the value "morning" in a variable named $time. Then write an if/else directive that will color all <a> tags. If the variable $time is equal to "morning", the color should be red. Otherwise, if the variable is "afternoon", the color should be blue. Finally, if the variable is set to anything else, the color should be gray.

My scss:

/* Write your SCSS code below. */ @mixin cars($make, $color) { .#{$make} { border: 1px solid black; background-image: url("img/#{$color}.png"); } }

$time: morning;

@mixin a($time) { @if $time == morning { color: red; } @else if $time == afternoon { color: blue; } @else { color: gray; } }