// Animation Duration
//
// The animation-duration property defines duration of a single animation cycle.
//
// Values: <time>
// Default: 0s
//
// https://www.w3.org/TR/css-animations-1/#animation-duration
@mixin animation-duration($value: 0s) {
  -webkit-animation-duration: $value;
     -moz-animation-duration: $value;
       -o-animation-duration: $value;
          animation-duration: $value;
}