.rainbow{
 -webkit-animation:rainbow 4s linear infinite;
animation:rainbow 4s linear infinite;
background-image:url(https://cracked.to/images/onyx-bg.gif);	
font-weight: bold;
}

@keyframes rainbow {
  from {
color: #87FCE8;
text-shadow: 0 0 10px #87FCE8;
  }
  15% {
color: #FBDE00;
text-shadow: 0 0 10px #FBDE00;
  }
  30% {
  color: #7BA00C;
text-shadow: 0 0 10px #7BA00C;
  }
  45% {
color: #CFD6DB;
text-shadow: 0 0 10px #CFD6DB;
  }
  60% {
color: #FFA751;
text-shadow: 0 0 10px #FFA751;
  }
  75% {
color: #ABBB76;
text-shadow: 0 0 10px #ABBB76;
  }
  90% {
color: #6DADFC;
text-shadow: 0 0 10px #6DADFC;
  }
  to {
color: #99F1C8;
text-shadow: 0 0 10px #99F1C8;
  }
}
@-webkit-keyframes rainbow {
  from {
color: #87FCE8;
text-shadow: 0 0 10px #87FCE8;
  }
  15% {
color: #FBDE00;
text-shadow: 0 0 10px #FBDE00;
  }
  30% {
  color: #7BA00C;
text-shadow: 0 0 10px #7BA00C;
  }
  45% {
color: #CFD6DB;
text-shadow: 0 0 10px #CFD6DB;
  }
  60% {
color: #FFA751;
text-shadow: 0 0 10px #FFA751;
  }
  75% {
color: #ABBB76;
text-shadow: 0 0 10px #ABBB76;
  }
  90% {
color: #6DADFC;
text-shadow: 0 0 10px #6DADFC;
  }
  to {
color: #99F1C8;
text-shadow: 0 0 10px #99F1C8;
  }
}