.GithubCorner {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 2;
}
.GithubCorner svg {
  fill: #151513;
  color: #fff;
  border: 0;
  max-width: 12.5vmin;
  max-height: 12.5vmin;
}

.GithubCorner .octo-arm {
  transform-origin: 130px 106px;
}

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

@media (max-width: 500px) {
  .GithubCorner:hover .octo-arm {
    animation: none;
  }

  .GithubCorner .octo-arm {
    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);
  }
}