#container{
  position: absolute;
  bottom:0px;
  width: 50%;
  left: 50vw;
  transform: translateX(-50%) translateY(-60vh);
  z-index: 5;
}
.star{
  border-radius: 100%;
  background-color: white;
  position: absolute;
  z-index: -1;
  animation: moveit;
  animation-duration: 2.5s;
  animation-iteration-count: infinite;
  opacity: 0;
  transition: opacity 0.3s;
} 

@keyframes moveit{
  0% {opacity: 0.2;}
  50% {opacity: 0.8;}
  100% {opacity: 0.2;} 
}

@media screen and (max-width: 1000px) {
  #container{
    width: 100%;
    left: 0px;
    transform: translateX(0px) translateY(-60vh);
  }
}