.winner {
  animation: glow 0.5s ease;
}

@keyframes glow {
  0% {
    box-shadow: 0 0 0px #fff;
  }
  50% {
    box-shadow: 0 0 12px #facc15;
  }
  100% {
    box-shadow: 0 0 0px #fff;
  }
}