// https://gist.github.com/ericam/1607696
=keyframes($name)
  @-webkit-keyframes #{$name}
    @content
  @-moz-keyframes #{$name}
    @content
  @-ms-keyframes #{$name}
    @content
  @keyframes #{$name}
    @content

=transition($transition-duration: .5s, $transition-property: all, $transition-timing: ease-in)
  +transition-property($transition-property)
  +transition-duration($transition-duration)
  +transition-timing-function($transition-timing)