@mixin transition($transition) {
  -moz-transition: $transition;
  -o-transition: $transition;
  -webkit-transition: $transition;
  transition: $transition;
}
@mixin transition-property($property) {
  -moz-transition-property: $property;
  -o-transition-property: $property;
  -webkit-transition-property: $property;
  transition-property: $property;
}
@mixin transition-duration($duration) {
  -moz-transition-property: $duration;
  -o-transition-property: $duration;
  -webkit-transition-property: $duration;
  transition-property: $duration;
}
@mixin transition-timing-function($timing) {
  -moz-transition-timing-function: $timing;
  -o-transition-timing-function: $timing;
  -webkit-transition-timing-function: $timing;
  transition-timing-function: $timing;
}
@mixin transition-delay($delay) {
  -moz-transition-delay: $delay;
  -o-transition-delay: $delay;
  -webkit-transition-delay: $delay;
  transition-delay: $delay;
}