.background-star {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at bottom, #1B2735 0%, #090A0F 100%);
  z-index: -1;
  overflow: hidden;
}

h1{
  color: white;
}

#stars, #stars2, #stars3 {
  position: absolute;
  border-radius: 60px;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  background: transparent;
  border-radius: 60px;
  animation: animStar 50s linear infinite;
}

#stars2 {
  width: 2px;
  height: 2px;
  animation-duration: 100s;
}

#stars3 {
  width: 3px;
  height: 3px;
  animation-duration: 150s;
}

#stars::after,
#stars2::after,
#stars3::after {
  content: "";
  position: absolute;
  top: 2000px;
  width: inherit;
  height: inherit;
  background: transparent;
}

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