body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -999;
  background-color: black;
}

.star {
  position: absolute;
  border-radius: 50%;
  animation: shootingStars linear infinite;
  transform-origin: center center;
  animation-duration: 0.5s;
  opacity: 0;
}

.star.pink {
  background-color: violet;
}

.star.blue {
  background-color: blue;
}

.star.purple {
  background-color: blueviolet;
}

@keyframes shootingStars {
  0% {
    transform: translate(-50%, 100%) scale(0);
    opacity: 0;
  }
  10% {
    transform: translate(-50%, 50%) scale(1);
    opacity: 1;
  }
  90% {
    transform: translate(-50%, -200%) scale(1);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -250%) scale(0);
    opacity: 0;
  }
}