Pure CSS Sine Wave Loading Animation Page

Here is an animated sine wave loading page. It is blocky. It could be further refined to have smaller sized blocks but the CSS will get quite long.

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Loading Page</title>
	<style>
	body {
		background-color: white;
		color: black;
		margin: 0;
		padding: 0;
	}
	.flex-container {
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		height: 100vh;
	}
	.loading {
		width: 80px;
		height: 30px;
		position: relative;
	}
	@keyframes loading {
		0%,100% {top: -10px;}
		25% {top: 10px;}
		50% {top: -10px;}
		75% {top: 10px;}
	}
	.loading .x {
		position: absolute;
		animation: loading 1.5s ease-in-out infinite;
		width: 10px;
		height: 10px;
	}
	.loading .x:nth-child(1) {
		left: 0px;
		background-color: rgb(32,0,0);
		animation-delay: 0s;
	}
	.loading .x:nth-child(2) {
		left: 10px;
		background-color: rgb(64,0,0);
		animation-delay: .1s;
	}
	.loading .x:nth-child(3) {
		left: 20px;
		background-color: rgb(96,0,0);
		animation-delay: .2s;
	}
	.loading .x:nth-child(4) {
		left: 30px;
		background-color: rgb(128,0,0);
		animation-delay: .3s;
	}
	.loading .x:nth-child(5) {
		left: 40px;
		background-color: rgb(160,0,0);
		animation-delay: .4s;
	}
	.loading .x:nth-child(6) {
		left: 50px;
		background-color: rgb(192,0,0);
		animation-delay: .5s;
	}
	.loading .x:nth-child(7) {
		left: 60px;
		background-color: rgb(224,0,0);
		animation-delay: .6s;
	}
	.loading .x:nth-child(8) {
		left: 70px;
		background-color: rgb(255,0,0);
		animation-delay: .7s;
	}
	</style>
</head>
<body>

<div id="root">
	<div class="flex-container">
		<div class="loading">
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
			<div class="x"></div>
		</div>
		<div>Please wait...</div>
	</div>
</div>
		
</body>
</html>

Coding Video

https://youtu.be/8u9z8sAO1m8