.stars {
  width: 5px;
  height: 5px;
  position: absolute;
  background-color: white;
  border-radius: 100%;
  z-index: 160;
  animation: animStar  linear infinite;
  
}

@keyframes animStar {
  from {
    transform: translateY(360px);
  }
  to {
    transform: translateY(-10px);
  }
}