Untitled

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Bars waves</title>
</head>
<body style="background: #545454">
	<div class="animated-bars">
		<div class="bar"></div>
		<div class="bar"></div>
		<div class="bar"></div>
		<div class="bar"></div>
		<div class="bar"></div>
	</div>

	<style>
		* {
			margin: 0;
			padding: 0;
		}
		body {
			display: flex;
			justify-content: center;
			align-items: center;
			height: 100vh;
		}
		.animated-bars {
			width: 100px;
			height: 50px;
			display: flex;
			justify-content: space-between;
		}

		.animated-bars .bar {
			background: #ccc;
			height: 100%;
			width: 10px;
			border-radius: 5px;
			position: relative;
			bottom: -50%;

			animation-timing-function: linear;
			animation-iteration-count: infinite;
			animation-direction: alternate;
			animation-duration: 0.5s;
		}

		.animated-bars .bar:nth-of-type(3) {
			animation-name: bar-wave-full;
			height: 80px;
			bottom: -60%;
		}

		.animated-bars .bar:nth-of-type(1),
		.animated-bars .bar:nth-of-type(5) {
			height: 100%;
			bottom: -50%;
			animation-name: bar-wave-one-third;
		}

		.animated-bars .bar:nth-of-type(2),
		.animated-bars .bar:nth-of-type(4) {
			height: 90%;
			bottom: -55%;
			animation-name: bar-wave-two-thirds;
		}

		@keyframes bar-wave-full {
			0% {
				height: 80%;
				bottom: -60%;
			}
			100% {
				height: 30%;
				bottom: -85%;
			}
		}

		@keyframes bar-wave-one-third {
			0% {
				height: 100%;
				bottom: -50%;
			}
			100% {
				height: 80%;
				bottom: -60%;
			}
		}

		@keyframes bar-wave-two-thirds {
			0% {
				height: 90%;
				bottom: -55%;
			}
			100% {
				height: 50%;
				bottom: -75%;
			}
		}
	</style>
</body>
</html>