I do not understand the Reusable CSS with mixins lesson

[Catalactics]

@codeofdreams

@mixin border-radius($radius) {
-webkit-border-radius:$x $y $blur $c; 
-moz-border-radius: $x $y $blur $c; 
-ms-border-radius: $x $y $blur $c; 
-box-border-radius: $x $y $blur $c;

Remember when I said it’s like a function?? So you want to pass the parameter INTO the stuff so like:

@mixin background-color($color) {
-webkit-background-color:$color;
-moz-background-color: $color;
-ms-background-color: $color;
-box-background-color: $color;