<div class="content">
  <h2 class="text-shadows">hey</h2>
</div>

// UPDATE: less lines of code

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --color-primary: #f6aca2;
  --color-secondary: #f49b90;
  --color-tertiary: #f28b7d;
  --color-quaternary: #f07a6a;
  --color-quinary: #ee6352;
}

body {
  min-height: 100vh;
  font-weight: 300;
  font-size: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  background-color: #eff8e2;
}

.content {
  display: flex;
  align-content: center;
  justify-content: center;
}

.text-shadows {
  text-shadow: 3px 3px 0 var(--color-secondary), 6px 6px 0 var(--color-tertiary),
    9px 9px var(--color-quaternary), 12px 12px 0 var(--color-quinary);
  font-family: bungee, sans-serif;
  font-weight: 400;
  text-transform: uppercase;
  font-size: calc(2rem + 5vw);
  text-align: center;
  margin: 0;
  color: var(--color-primary);
  animation: shadows 1.2s ease-in infinite;
  letter-spacing: 0.4rem;
}

@keyframes shadows {
  0% {
    text-shadow: none;
  }
  10% {
    transform: translate(-3px, -3px);
    text-shadow: 3px 3px 0 var(--color-secondary);
  }
  20% {
    transform: translate(-6px, -6px);
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary);
  }
  30% {
    transform: translate(-9px, -9px);
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary), 9px 9px var(--color-quaternary);
  }
  40% {
    transform: translate(-12px, -12px);
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary), 9px 9px var(--color-quaternary),
      12px 12px 0 var(--color-quinary);
  }
  50% {
    transform: translate(-12px, -12px);
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary), 9px 9px var(--color-quaternary),
      12px 12px 0 var(--color-quinary);
  }
  60% {
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary), 9px 9px var(--color-quaternary),
      12px 12px 0 var(--color-quinary);
  }
  70% {
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary), 9px 9px var(--color-quaternary);
  }
  80% {
    text-shadow: 3px 3px 0 var(--color-secondary),
      6px 6px 0 var(--color-tertiary);
  }
  90% {
    text-shadow: 3px 3px 0 var(--color-secondary);
  }
  100% {
    text-shadow: none;
  }
}

/*
  --color-primary: #5192ED;
  --color-secondary: #69A1F0;
  --color-tertiary: #7EAEF2;
  --color-quaternary: #90BAF5;
  --color-quinary: #A2C4F5;
*/