* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: white;
  text-align: center;
  background: linear-gradient(120deg,
    #ff0000,
    #ff7f00,
    #ffff00,
    #00ff00,
    #0000ff,
    #4b0082,
    #8f00ff);
  background-size: 400% 400%;
  animation: rainbow 12s ease infinite;
}

.content {
  padding: 2rem 3rem;
  border-radius: 1.5rem;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

h1 {
  font-size: 2.8rem;
  margin-bottom: 0.75rem;
}

p {
  font-size: 1.1rem;
}

@keyframes rainbow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}