- colors = ['#7c4dff', '#0091ea', '#ff9100', '#ff1744']

- colors.each do |color|
  .hello{style: "color: #{color}"} easy

.hello {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 25vw;
  animation-name: wave;
  animation-iteration-count: infinite;
  animation-timing-function: ease-in-out;
  font-family: "Righteous", cursive;
  -webkit-text-stroke-width: 3px;
  -webkit-text-stroke-color: black;
}

@for $i from 1 through 4 {
  .hello:nth-of-type(#{$i}) {
    animation-duration: 2s;
    animation-delay: 0.8s - ($i / 4);
  }
}

@keyframes wave {
  40%,
  50% {
    transform: translate(-50%, -65%) scale(1.05);
  }

  0%,
  90%,
  100% {
    transform: translate(-50%, -45%) scale(0.95);
  }
}