sass-site/source/assets/stylesheets/dependencies/_animations.scss

$default-transition-duration: 2s;

@mixin animation-name($animation-name: animate) {
  -webkit-animation-name: $animation-name;
  -moz-animation-name: $animation-name;
  -ms-animation-name: $animation-name;
  -o-animation-name: $animation-name;
  animation-name: $animation-name;
}

@mixin animation-duration($animation-duration) {
  -webkit-animation-duration: $animation-duration;
  -moz-animation-duration: $animation-duration;
  -ms-animation-duration: $animation-duration;
  -o-animation-duration: $animation-duration;
  animation-duration: $animation-duration;
}

@mixin animation-iteration-count($animation-iteration-count: infinite) {
  -webkit-animation-iteration-count: $animation-iteration-count;
  -moz-animation-iteration-count: $animation-iteration-count;
  -ms-animation-iteration-count: $animation-iteration-count;
  -o-animation-iteration-count: $animation-iteration-count;
  animation-iteration-count: $animation-iteration-count;
}

@mixin animation-direction($animation-direction: linear) {
  -webkit-animation-direction: $animation-direction;
  -moz-animation-direction: $animation-direction;
  -ms-animation-direction: $animation-direction;
  -o-animation-direction: $animation-direction;
  animation-direction: $animation-direction;
}

@mixin animation-delay($animation-delay) {
  -webkit-animation-delay: $animation-delay;
  -moz-animation-delay: $animation-delay;
  -ms-animation-delay: $animation-delay;
  -o-animation-delay: $animation-delay;
  animation-delay: $animation-delay;
}

@mixin keyframes-value-transition($property, $value-start, $value-end) {
  0% {
    #{$property}: $value-start;
  }
  100% {
    #{$property}: $value-end;
  }
}

@mixin keyframes($animation-name, $property, $value-start, $value-end) {
  @-webkit-keyframes #{$animation-name} {
    @include keyframes-value-transition($property, $value-start, $value-end);
  }

  @-moz-keyframes #{$animation-name} {
    @include keyframes-value-transition($property, $value-start, $value-end);
  }

  @-ms-keyframes #{$animation-name} {
    @include keyframes-value-transition($property, $value-start, $value-end);
  }

  @-o-keyframes #{$animation-name} {
    @include keyframes-value-transition($property, $value-start, $value-end);
  }

  @keyframes #{$animation-name} {
    @include keyframes-value-transition($property, $value-start, $value-end);
  }
}