[CSS] text rainbow 효과

.ai-text{
  animation-duration: 3s;
  animation-name: rainbowText;
  animation-iteration-count: infinite;  
}
@keyframes rainbowText {
  0% { color: #ff2a2a; }
  15% { color: #ff7a2a; }
  30% { color: #ffc52a; }
  45% { color: #43ff2a; }
  60% { color: #2a89ff; }
  75% { color: #202082; }
  90% { color: #6b2aff; }
  100% { color: #e82aff; }
}