html {
  height: 800px;
  width: 600px;
  /*background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%); */
  overflow: hidden;
}

#stars {
  width: 1px;
  height: 1px;
  background: transparent;
  animation: animStar 25s linear infinite;
  box-shadow: 201px 65px #FFF , 124px 28px #FFF , 78px 50px #FFF , 642px 150px #FFF , 342px 597px #FFF , 721px 377px #FFF , 263px 620px #FFF , 632px 1040px #FFF , 10px 941px #FFF;
}
#stars:after {
  content: " ";
  position: absolute;
  top: 800px;
  left: 600px;
  width: 1px;
  height: 1px;
  background: transparent;
  box-shadow: 201px 65px #FFF , 786px 745px #FFF , 720px 31px #FFF , 642px 45px #FFF , 342px 597px #FFF , 21px 377px #FFF , 263px 20px #FFF , 632px 40px #FFF , 10px 41px #FFF;
}

#stars2 {
  width: 2px;
  height: 2px;
  background: transparent;
  box-shadow: 293px 91px #FFF , 81px 84px #FFF , 434px 378px #FFF , 269px 652px #FFF , 386px 500px #FFF , 672px 88px #FFF , 384px 394px #FFF , 120px 778px #FFF , 200px 696px #FFF;
  animation: animStar 50s linear infinite;
}
#stars2:after {
  content: " ";
  position: absolute;
  top: 800px;
  width: 2px;
  height: 2px;
  background: transparent;
  box-shadow: 293px 91px #FFF , 81px 84px #FFF , 434px 378px #FFF , 269px 652px #FFF , 386px 500px #FFF , 672px 88px #FFF , 384px 394px #FFF , 120px 778px #FFF , 200px 696px #FFF;
}

#stars3 {
  width: 3px;
  height: 3px;
  background: transparent;
  box-shadow: 73px 570px #FFF , 24px 476px #FFF , 32px 741px #FFF , 686px 48px #FFF , 35px 727px #FFF , 519px 304px #FFF , 738px 217px #FFF , 868px 678px #FFF , 33px 76px #FFF;
  animation: animStar 75s linear infinite;
}
#stars3:after {
  content: " ";
  position: absolute;
  top: 800px;
  left: 600px;
  width: 3px;
  height: 3px;
  background: transparent;
  box-shadow: 506px 570px #FFF , 24px 476px #FFF , 32px 741px #FFF , 686px 48px #FFF , 35px 727px #FFF , 519px 304px #FFF , 738px 217px #FFF , 68px 678px #FFF , 33px 76px #FFF;
}

@keyframes animStar {
  from {
    transform: translateY(0px);
  }
  to {
    transform: translateY(-2000px);
  }
}