#apple,
#twitter,
#github,
#facebook {
  font-size: 4em;
  background-color: #18191f;
  color: #fff;
  box-shadow: 2px 2px 2px #f1de02, 2px 2px 2px #f1de02,
    2px 2px 2px #f1de02, 2px 2px 3px #f1de02, inset 2px 2px 2px #f1de02,
    inset 2px 2px 1px #f1de02, inset 2px 2px 2px #f1de02,
    inset 2px 2px 1px #f1de02;
  border-radius: 29px;
  padding: 11px 15px;
  margin: 0 20px;
  animation: animate 1s linear infinite;
 
}
#twitter {
  animation-delay: 0.3s;
}
#facebook {
  animation-delay: 0.7s;
}
#github {
  animation-delay: 0.1s;
}

@keyframes animate {
  from {
    filter: hue-rotate(0deg);
  }
  to {
    filter: hue-rotate(360deg);
  }
}