.twinkling-star1 {
  animation: 3s linear 1s infinite alternate twinkle;
}

.twinkling-star2 {
  animation: 4s linear 0s infinite alternate twinkle;
}

.twinkling-star3 {
  animation: 3.5s linear 0.5s infinite alternate twinkle;
}

.twinkling-star4 {
  animation: 1.25s linear 1.5s infinite alternate twinkle;
}

.twinkling-star5 {
  animation: 4s linear 2s infinite alternate twinkle;
}

.twinkling-star6 {
  animation: 2.5s linear 1s infinite alternate twinkle;
}

@keyframes twinkle {
  0% {
    opacity: 1;
  }
  30% {
    opacity: 1;
  }
  50% {
    opacity: 0.25;
  }
  70% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}