Northern Lights CSS button

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: 14px 34px;
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.2;
  color: #082f49;
  background: linear-gradient(90deg, #22d3ee 0%, #a78bfa 50%, #34d399 100%);
  background-size: 200% 200%;
  border: 0;
  border-radius: 999px;
  box-shadow: 0 12px 28px -10px rgba(34, 211, 238, .59999999999999997779553950749686919152736663818359375);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  transition: transform 200ms cubic-bezier(.2,.8,.2,1), box-shadow 200ms cubic-bezier(.2,.8,.2,1), filter 200ms cubic-bezier(.2,.8,.2,1);
  animation: btn-flow 4s ease-in-out infinite alternate;
}

.btn__icon {
  display: inline-block;
  transition: transform 200ms cubic-bezier(.2,.8,.2,1);
}

.btn:hover {
  transform: translateY(-2px) scale(1.0300000000000000266453525910037569701671600341796875);
  filter: brightness(1.0500000000000000444089209850062616169452667236328125);
  box-shadow: 0 14px 32px -10px rgba(34, 211, 238, .59999999999999997779553950749686919152736663818359375);
}

.btn:hover .btn__icon {
  transform: translateX(-3px);
}

.btn:active {
  transform: translateY(1px) scale(0.979999999999999982236431605997495353221893310546875);
  box-shadow: 0 11px 28px -10px rgba(34, 211, 238, .59999999999999997779553950749686919152736663818359375);
  transition-duration: 100ms;
}

.btn:focus-visible {
  outline: 3px solid #22d3ee;
  outline-offset: 3px;
}

@keyframes btn-flow {
  from {
    background-position: 0% 50%;
  }
  to {
    background-position: 100% 50%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn,
  .btn__icon {
    transition: none;
    animation: none;
  }
}

<button class="btn" type="button">
  <span class="btn__icon" aria-hidden="true">✦</span>
  Explore
</button>