SOURCE

<div class="loading">
		<span></span>
		<span></span>
		<span></span>
		<span></span>
		<span></span>
</div>

.loading{
	width: 150px;
	height: 15px;
	margin: 0 auto;
	position: relative;
	margin-top:100px;
}
.loading span{
	position: absolute;
	width: 15px;
	height: 100%;
	border-radius: 50%;
	background: lightgreen;
	-webkit-animation: load 1.04s ease-in infinite alternate;
}
@-webkit-keyframes load{
	0%{
		opacity: 1;
		-webkit-transform: translate(0px);
	}
	100%{
		opacity: 0.2;
		-webkit-transform: translate(150px);
	}
}
.loading span:nth-child(1){
	-webkit-animation-delay:0.13s;
}
.loading span:nth-child(2){
	-webkit-animation-delay:0.26s;
}
.loading span:nth-child(3){
	-webkit-animation-delay:0.39s;
}
.loading span:nth-child(4){
	-webkit-animation-delay:0.52s;
}
.loading span:nth-child(5){
	-webkit-animation-delay:0.65s;
}