@keyframes rainbow {
  0% {color:red;}
  25% {color:yellow}
  50% {color:green}
  75%{color:blue}
  100% {color: purple;}
}

body{
  background-image: url(/images/transmission.gif);
}
.subject{
  display: block;
  margin-right: auto;
  margin-left: auto;
  width: 40%;
  min-width: 400px;
}

.link{
  font-size: 300%;
  display: table;
  margin: auto;
  animation: rainbow 1s infinite alternate;
}