// generic transform
@mixin transform($transforms...) {
    -webkit-transform: $transforms;
    -moz-transform: $transforms;
    transform: $transforms;
}
// rotate
@mixin rotate ($deg) {
    @include transform(rotate(#{$deg}deg));
}
// scale
@mixin scale($scale) {
    @include transform(scale($scale));
} 
// translate
@mixin translate ($x, $y) {
    @include transform(translate($x, $y));
}
// skew
@mixin skew ($x, $y) {
    @include transform(skew(#{$x}deg, #{$y}deg));
}
//transform origin
@mixin transform-origin ($origin) {
    moz-transform-origin: $origin;
    -o-transform-origin: $origin;
    -ms-transform-origin: $origin;
    -webkit-transform-origin: $origin;
    transform-origin: $origin;
}