body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100dvh; /* Dynamic height for mobile */
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #111;
  font-family: "Arial", sans-serif;
  
}

.rainbow-text {
  text-align: center;
  margin: 0;
  padding: 0 10px;
  font-size: 10vw;
  
  /* Pick one vibrant starting color */
  color: #ef5350; 
  
  /* The Magic: Hue Rotation */
  animation: color-cycle 20s linear infinite;
}

@keyframes color-cycle {
  from {
    filter: hue-rotate(0deg);
  }
  to {
    filter: hue-rotate(360deg);
  }
}