<div class="container">
  <div class="ball"></div>
  <div class="ball"></div>
  <div class="ball"></div>
  <div class="ball"></div>
  <div class="ball"></div>
  <div class="ball"></div>
  <div class="ball"></div>
</div>
body {
	margin: 0;
	padding: 0;
	background: #000000;
}

.container {
	width: 200px;
	height: 100px;
	padding-top: 100px;
	margin: 0 auto;
}

.ball {
	width: 10px;
	height: 10px;
	margin: 10px auto;
	border-radius: 50px;
}

.ball:nth-child(1) {
	background: #ffffff;
	-webkit-animation: right 1s infinite ease-in-out;
	-moz-animation: right 1s infinite ease-in-out;
	animation: right 1s infinite ease-in-out;
}

.ball:nth-child(2) {
	background: #ffffff;
	-webkit-animation: left 1.1s infinite ease-in-out;
	-moz-animation: left 1.1s infinite ease-in-out;
	animation: left 1.1s infinite ease-in-out;
}

.ball:nth-child(3) {
	background: #ffffff;
	-webkit-animation: right 1.05s infinite ease-in-out;
	-moz-animation: right 1.05s infinite ease-in-out;
	animation: right 1.05s infinite ease-in-out;
}

.ball:nth-child(4) {
	background: #ffffff;
	-webkit-animation: left 1.15s infinite ease-in-out;
	-moz-animation: left 1.15s infinite ease-in-out;
	animation: left 1.15s infinite ease-in-out;
}

.ball:nth-child(5) {
	background: #ffffff;
	-webkit-animation: right 1.1s infinite ease-in-out;
	-moz-animation: right 1.1s infinite ease-in-out;
	animation: right 1.1s infinite ease-in-out;
}

.ball:nth-child(6) {
	background: #ffffff;
	-webkit-animation: left 1.05s infinite ease-in-out;
	-moz-animation: left 1.05s infinite ease-in-out;
	animation: left 1.05s infinite ease-in-out;
}

.ball:nth-child(7) {
	background: #ffffff;
	-webkit-animation: right 1s infinite ease-in-out;
	-moz-animation: right 1s infinite ease-in-out;
	animation: right 1s infinite ease-in-out;
}

@-webkit-keyframes right {
	0% {
		-webkit-transform: translate(-15px);
	}
	50% {
		-webkit-transform: translate(15px);
	}
	100% {
		-webkit-transform: translate(-15px);
	}
}

@-webkit-keyframes left {
	0% {
		-webkit-transform: translate(15px);
	}
	50% {
		-webkit-transform: translate(-15px);
	}
	100% {
		-webkit-transform: translate(15px);
	}
}

@-moz-keyframes right {
	0% {
		-moz-transform: translate(-15px);
	}
	50% {
		-moz-transform: translate(15px);
	}
	100% {
		-moz-transform: translate(-15px);
	}
}

@-moz-keyframes left {
	0% {
		-moz-transform: translate(15px);
	}
	50% {
		-moz-transform: translate(-15px);
	}
	100% {
		-moz-transform: translate(15px);
	}
}

@keyframes right {
	0% {
		transform: translate(-15px);
	}
	50% {
		transform: translate(15px);
	}
	100% {
		transform: translate(-15px);
	}
}

@keyframes left {
	0% {
		transform: translate(15px);
	}
	50% {
		transform: translate(-15px);
	}
	100% {
		transform: translate(15px);
	}
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js