body{
	margin: 0;
	padding: 0;
}
ul{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%.-50%);
	display: flex;
}
ul li{
	list-style: none;
	width: 6px;
	height: 20px;
	background: #262626;
	margin: 0 4px;
	animation: animate .7s infinite alternate;
}

@keyframes animate{
	0%{
		transform: scaleY(1);
	}
	25%{
		transform: scaleY(1);
	}
	50%{
		transform: scaleY(1);
	}
	75%{
		transform: scaleY(1);
	}
	100%{
		transform: scaleY(3);
	}
}
ul li:nth-child(1){
	animation-delay: 0.1s;
}
ul li:nth-child(2){
	animation-delay: 0.2s;
}
ul li:nth-child(3){
	animation-delay: 0.3s;
}
ul li:nth-child(4){
	animation-delay: 0.4s;
}
ul li:nth-child(5){
	animation-delay: 0.5s;
}
ul li:nth-child(6){
	animation-delay: 0.6s;
}