:root {
  background: #0fb;
}
.rainbow {
  text-align: center;
  text-decoration: underline;
  font-size: 61.8pt;
  font-weight: bold;
  font-family: Helvetica, Verdana, sans-serif;
}
.rainbow_text_animated {
  background: linear-gradient(to right, dodgerblue, turquoise, aquamarine , mediumspringgreen, dodgerblue);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: rainbow_animation 6s ease-in-out infinite;
  background-size: 700% 100%;
}

@keyframes rainbow_animation {
  0%,100% {
    background-position: 0 0;
  }

  50% {
    background-position: 100% 0;
  }
}