@mixin perspective($value){
    -webkit-perspective: $value;
    -moz-perspective: $value;
    -o-perspective: $value;
    -ms-perspective: $value;
    perspective: $value;
}
@mixin transitions($time, $type){
    -webkit-transition: all $time $type;
    -moz-transition: all $time $type;
    -o-transition: all $time $type;
    -ms-transition: all $time $type;
    transition: all $time $type;
}

@mixin transitions-property($property, $time, $type){
    -webkit-transition: $property $time $type;
    -moz-transition: $property $time $type;
    -o-transition: $property $time $type;
    -ms-transition: $property $time $type;
    transition: $property $time $type;
}
@mixin transform-style($type){
    -webkit-transform-style: $type;
    -moz-transform-style: $type;
    -o-transform-style: $type;
    -ms-transform-style: $type;
    transform-style: $type;
}

@mixin backface-visibility($type){
    -webkit-backface-visibility: $type;
    -moz-backface-visibility: $type;
    -o-backface-visibility: $type;
    -ms-backface-visibility: $type;
        backface-visibility: $type;
}

@mixin rotateY-180() {
    -webkit-transform: rotateY( 180deg );
    -moz-transform: rotateY( 180deg );
    -o-transform: rotateY( 180deg );
    -ms-transform: rotateY(180deg);
    transform: rotateY( 180deg );
}