.github {
  height: 80px;
  width: 80px;
  position: fixed;
  right: 0;
  top: 0;
  transform: translateZ(0);
  z-index: 1;

  &:hover {

    .github__arm {

      @media (min-width: $media-sm) {
        animation: octocat-wave 560ms ease-in-out;
      }

    }

  }

  &__arm {
    transform-origin: 130px 106px;
  }

}

@keyframes octocat-wave{

  0%, 100%{
    transform: rotate(0);
  }

  20%, 60%{
    transform: rotate(-25deg);
  }
  40%, 80%{
    transform: rotate(10deg);
  }

}