@mixin prefixed-transition($property, $timing, $timing-functions...) {
    -webkit-transition: $property $timing $timing-functions;
    -moz-transition: $property $timing $timing-functions;
    -o-transition: $property $timing $timing-functions;
    -ms-transition: $property $timing $timing-functions;
    transition: $property $timing $timing-functions;
}

@mixin prefixed-user-select($value) {
    -webkit-touch-callout: $value;
    -webkit-user-select: $value;
    -moz-user-select: $value;
    -ms-user-select: $value;
    user-select: $value;
}