htmll程式碼:

<div id="preloader_1">
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	<span></span>
</div>

css程式碼:

#preloader_1 {
	position: relative;
	margin: 100px 500px;
}

#preloader_1 span {
	display: block;
	bottom: 0px;
	width: 9px;
	height: 5px;
	background: #9b59b6;
	position: absolute;
	animation: preloader_1 1.5s infinite ease-in-out;
}

#preloader_1 span:nth-child(2) {
	left: 11px;
	animation-delay: .2s;
}

#preloader_1 span:nth-child(3) {
	left: 22px;
	animation-delay: .4s;
}

#preloader_1 span:nth-child(4) {
	left: 33px;
	animation-delay: .6s;
}

#preloader_1 span:nth-child(5) {
	left: 44px;
	animation-delay: .8s;
}

@keyframes preloader_1 {
	0% {
		height: 5px;
		transform: translateY(0px);
		background: #9b59b6;
	}
	25% {
		height: 30px;
		transform: translateY(15px);
		background: #3498db;
	}
	50% {
		height: 5px;
		transform: translateY(0px);
		background: #9b59b6;
	}
	100% {
		height: 5px;
		transform: translateY(0px);
		background: #9b59b6;
	}
}