preloader.css

/* ini: Preloader */
 
#preloader {
    position:fixed;
    top:0;
    left:0;
    right:0;
    bottom:0;
    background-color:#001eff; /* cor do background que vai ocupar o body */
    z-index:999; /* z-index para jogar para frente e sobrepor tudo */
}
#preloader .inner {
    position: absolute;
    top: 50%; /* centralizar a parte interna do preload (onde fica a animação)*/
    left: 50%;
    transform: translate(-50%, -50%);  
}
.bolas > div {
  display: inline-block;
  background-color: #fff;
  width: 25px;
  height: 25px;
  border-radius: 100%;
  margin: 3px;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  animation-name: animarBola;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
   
}
.bolas > div:nth-child(1) {
    animation-duration:0.75s ;
    animation-delay: 0;
}
.bolas > div:nth-child(2) {
    animation-duration: 0.75s ;
    animation-delay: 0.12s;
}
.bolas > div:nth-child(3) {
    animation-duration: 0.75s  ;
    animation-delay: 0.24s;
}
 
@keyframes animarBola {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 1;
  }
  16% {
    -webkit-transform: scale(0.1);
    transform: scale(0.1);
    opacity: 0.7;
  }
  33% {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 1; 
  } 
}
/* end: Preloader */