search-engine-optimization/_sass/modules/_github.scss

.github-corner {
  height: 80px;
  width: 80px;
  position: fixed;
  right: 0;
  top: 0;
  transform: translate3d(0, 0, 0);
  z-index: 1;

  &:hover {

    .octo-arm {
      animation: octocat-wave 560ms ease-in-out;

      @media (max-width: 500px) {
        animation: none;
      }

    }

  }

  .github-corner .octo-arm {

    @media (max-width: 500px) {
      animation: octocat-wave 560ms ease-in-out;
    }

  }

}

@keyframes octocat-wave{

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

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

}