@import url("https://fonts.googleapis.com/css?family=Lato:300");

.rainbow {
  position: relative;
}

.rainbow:before, .rainbow:after {
  content: '';
  position: absolute;
  left: -2px;
  top: -2px;
  background: linear-gradient(45deg, #fb0094, #0000ff, #00ff00,#ffff00, #ff0000, #fb0094, 
    #0000ff, #00ff00,#ffff00, #ff0000);
  background-size: 900%;
  width: calc(100% + 4px);
  height: calc(100% + 4px);
  z-index: -1;
  animation: steam 20s linear infinite;
}

@keyframes steam {
  0% {
    background-position: 0 0;
  }
  50% {
    background-position: 100% 0;
  }
  100% {
    background-position: 0 0;
  }
}

.rainbow:after {
  filter: blur(5px);
}