//variables
$pink: #ee7579;

body {
  background: $pink;
}
#cat {
  max-width: 300px;
  margin: 0 auto;
}
#cauda {
  width: 72px;
  height: 79px;
  @include animation(cauda 6s linear infinite);
  @include transform-origin(80%, 80%);
}

@include keyframes(cauda) {
  0% { @include rotate(-10deg);}
  50% { @include rotate(30deg);}
  100% { @include rotate(-10deg);}
}