#space,.stars{overflow:hidden;top:0;bottom:0;left:0;right:0;z-index:-1}
#space{position:fixed}
.stars {position:absolute;background-image:radial-gradient(2px 2px at 20px 30px, #eee, rgba(0,0,0,0)),radial-gradient(2px 2px at 40px 70px, #fff, rgba(0,0,0,0)),radial-gradient(2px 2px at 50px 160px, #ddd, rgba(0,0,0,0)),radial-gradient(2px 2px at 90px 40px, #fff, rgba(0,0,0,0)),radial-gradient(2px 2px at 130px 80px, #fff, rgba(0,0,0,0)),radial-gradient(2px 2px at 160px 120px, #ddd, rgba(0,0,0,0));background-repeat:repeat;background-size:200px 200px;animation:zoom 5s infinite;opacity:0}

.stars:nth-child(1){background-position: 50%  50%;animation-delay:0s}
.stars:nth-child(2){background-position: 20%  60%;animation-delay:1s}
.stars:nth-child(3){background-position:-20% -30%;animation-delay:2s}
.stars:nth-child(4){background-position: 40% -80%;animation-delay:3s}
.stars:nth-child(5){background-position:-20%  30%;animation-delay:4s}

@keyframes zoom {
   0%{opacity:0;transform:scale(0.5);animation-timing-function:ease-in} 
  85%{opacity:1;transform:scale(2.8);animation-timing-function:linear}
 100%{opacity:0;transform:scale(3.5)}
}