sass color mixins?

sasscolormixins.scss

$mid:#66CCFF;

@mixin colors($mid){
    $lightest:lighten($mid, 50%);
    $lighter:lighten($mid, 29%);
    $light:lighten($mid, 25%);
    $midder:darken($mid, 25%);
    $dark:darken($mid, 40%);
    $darkest:darken($mid, 60%);
    $select:complement($dark);
}