.demo-party {
  animation: demo-party 5000ms infinite;
}

@keyframes demo-party {
  0% { background: #00f; }
  10% { background: #8e44ad; }
  20% { background: #1abc9c; }
  30% { background: #d35400; }
  40% { background: #00f; }
  50% { background: #34495e; }
  60% { background: #00f; }
  70% { background: #2980b9; }
  80% { background: #f1c40f; }
  90% { background: #2980b9; }
  100% { background: #0ff; }
}