.demo1-ball {
  border-radius: 99px;
  background-color: white;
  width: 50px;
  height: 50px;
  border: 3px solid white;
  position: absolute;
  background-size: 50px;
}

.github-corner:hover .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)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}