.xt-stars {
  transform: perspective(500px);
  transform-style: preserve-3d;
  position: absolute;
  bottom: 0;
  perspective-origin: 50% 100%;
  left: 50%;
  animation: rotate 90s infinite linear;
}

.xt-star {
  width: 2px;
  height: 2px;
  background: #f7f7b6;
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0 -300px;
  transform: translate3d(0, 0, -300px);
  backface-visibility: hidden;
}

@keyframes rotate {
  0% {
    transform: perspective(400px) rotateZ(20deg) rotateX(-40deg) rotateY(0);
  }
  100% {
    transform: perspective(400px) rotateZ(20deg) rotateX(-40deg)
      rotateY(-360deg);
  }
}

.xt-star2 {
  display: block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #fff;
  position: relative;
  transform-origin: 100% 0;
  animation: star-ani 4s linear infinite;
  -webkit-animation: star-ani 5s linear infinite;
  box-shadow: 0 0 5px 5px rgba(255, 255, 255, 0.3);
  opacity: 0;
  z-index: 2;
}

.xt-star2:after {
  content: '';
  display: block;
  top: 0px;
  left: 4px;
  border: 0px solid #fff;
  border-width: 0px 90px 2px 90px;
  border-color: transparent transparent transparent rgba(255, 255, 255, 0.3);
  transform: rotate(-45deg) translate3d(1px, 3px, 0);
  box-shadow: 0 0 1px 0 rgba(255, 255, 255, 0.1);
  transform-origin: 0% 100%;
}

.xt-star2-second {
  background: #fff;
  animation-delay: 3s;
  -webkit-animation-delay: 3s;
  -moz-animation-delay: 3s;
}

.xt-star2-second:after {
  border-color: transparent transparent transparent #fff;
  animation-delay: 3s;
  -webkit-animation-delay: 3s;
  -moz-animation-delay: 3s;
}

.xt-star2-third {
  background: #fff;
  animation-delay: 7s;
  -webkit-animation-delay: 7s;
  -moz-animation-delay: 7s;
}

.xt-star2-third:after {
  border-color: transparent transparent transparent #fff;
  -webkit-animation-delay: 7s;
  -moz-animation-delay: 7s;
  animation-delay: 7s;
}

@keyframes star-ani {
  0% {
    opacity: 0;
    transform: scale(0) translate3d(0, 0, 0);
  }

  20% {
    opacity: 0.8;
    transform: scale(0.2) translate3d(-100px, 100px, 0);
  }

  40% {
    opacity: 0.8;
    transform: scale(0.4) translate3d(-200px, 200px, 0);
  }

  60% {
    opacity: 0.8;
    transform: scale(0.6) translate3d(-300px, 300px, 0);
  }

  80% {
    opacity: 1;
    transform: scale(1) translate3d(-350px, 350px, 0);
  }

  100% {
    opacity: 1;
    transform: scale(1.2) translate3d(-400px, 380px, 0);
  }
}