Hue Cycle

.btn-hue-cycle {
  display: inline-block;
  padding: 13px 28px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #06b6d4, #8b5cf6);
  color: #ffffff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  animation: btn-hue-cycle-spin 5s linear infinite;
}
.btn-hue-cycle:hover {
  animation-duration: 1.5s;
}
@keyframes btn-hue-cycle-spin {
  to {
    filter: hue-rotate(360deg);
  }
}