SOURCE

<div id="spinners">
  <div id="preloader_4">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </div>
</div>

#spinners{
  position: absolute;
  top: 50%;
  left: 50%;
}
#preloader_4{
	position:relative;
}
#preloader_4 span{
	position:absolute;
	width:20px;
	height:20px;
	background:#3498db;
	opacity:0.5;
border-radius:20px;
	-webkit-animation: preloader_4 1s infinite ease-in-out;
	-moz-animation: preloader_4 1s infinite ease-in-out;
	-ms-animation: preloader_4 1s infinite ease-in-out;
	-animation: preloader_4 1s infinite ease-in-out;

}
#preloader_4 span:nth-child(2){
	left:20px;
	-webkit-animation-delay: .2s;
	-moz-animation-delay: .2s;
	-ms-animation-delay: .2s;
	animation-delay: .2s;
}
#preloader_4 span:nth-child(3){
	left:40px;
	-webkit-animation-delay: .4s;
	-moz-animation-delay: .4s;
	-ms-animation-delay: .4s;
	animation-delay: .4s;
}
#preloader_4 span:nth-child(4){
	left:60px;
	-webkit-animation-delay: .6s;
	-moz-animation-delay: .6s;
	-ms-animation-delay: .6s;
	animation-delay: .6s;
}
#preloader_4 span:nth-child(5){
	left:80px;
	-webkit-animation-delay: .8s;
	-moz-animation-delay: .8s;
	-ms-animation-delay: .8s;
	animation-delay: .8s;
}

@-webkit-keyframes preloader_4 {
    0% {opacity: 0.3; -webkit-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
    50% {opacity: 1; -webkit-transform: translateY(-10px); background:#f1c40f;	box-shadow: 0px 20px 3px rgba(0, 0, 0, 0.05);}
  	100%  {opacity: 0.3; -webkit-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
}
@-moz-keyframes preloader_4 {
    0% {opacity: 0.3; -moz-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
    50% {opacity: 1; -moz-transform: translateY(-10px); background:#f1c40f;	box-shadow: 0px 20px 3px rgba(0, 0, 0, 0.05);}
  	100%  {opacity: 0.3; -moz-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
}
@-ms-keyframes preloader_4 {
    0% {opacity: 0.3; -ms-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
    50% {opacity: 1; -ms-transform: translateY(-10px); background:#f1c40f;	box-shadow: 0px 20px 3px rgba(0, 0, 0, 0.05);}
  	100%  {opacity: 0.3; -ms-transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
}
@keyframes preloader_4 {
    0% {opacity: 0.3; transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
    50% {opacity: 1; transform: translateY(-10px); background:#f1c40f;	box-shadow: 0px 20px 3px rgba(0, 0, 0, 0.05);}
  	100%  {opacity: 0.3; transform:translateY(0px);	box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.1);}
}