@keyframes throb {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.throb-highlight {
  animation: throb 1.2s infinite;
  background-color: #ff6f00;
  color: #fff;
  border: 2px solid #ff6f00;
  font-weight: bold;
}