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CSS Only Animated Background Effects Html CSS Animation

CSS Only Animated Background Effects. Html CSS Animation.

Source Code:

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>CSS Animation Effects</title>
	<link rel="stylesheet" href="style.css">
</head>
<body>
	<div class="container">
		<div class="bubbles">
			<span style="--i:11"></span>
			<span style="--i:12"></span>
			<span style="--i:24"></span>
			<span style="--i:10"></span>
			<span style="--i:14"></span>
			<span style="--i:23"></span>
			<span style="--i:18"></span>
			<span style="--i:16"></span>
			<span style="--i:19"></span>
			<span style="--i:20"></span>
			<span style="--i:22"></span>
			<span style="--i:25"></span>
			<span style="--i:18"></span>
			<span style="--i:21"></span>
			<span style="--i:13"></span>
			<span style="--i:15"></span>
			<span style="--i:26"></span>
			<span style="--i:17"></span>
			<span style="--i:13"></span>
			<span style="--i:28"></span>
			<span style="--i:11"></span>
			<span style="--i:12"></span>
			<span style="--i:24"></span>
			<span style="--i:10"></span>
			<span style="--i:14"></span>
			<span style="--i:23"></span>
			<span style="--i:18"></span>
			<span style="--i:16"></span>
			<span style="--i:19"></span>
			<span style="--i:20"></span>
			<span style="--i:22"></span>
			<span style="--i:25"></span>
			<span style="--i:18"></span>
			<span style="--i:21"></span>
			<span style="--i:13"></span>
			<span style="--i:15"></span>
			<span style="--i:26"></span>
			<span style="--i:17"></span>
			<span style="--i:13"></span>
			<span style="--i:28"></span>
		</div>
	</div>
</body>
</html>

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CSS:

*
{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
body 
{
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	background: #0c192c;
}
.container 
{
	position: relative;
	width: 100%;
	height: 100vh;
	overflow: hidden;
}
.bubbles 
{
	position: relative;
	display: flex;
}
.bubbles span 
{
	position: relative;
	min-width: 30px;
	height: 30px;
	background: #4fc3dc;
	box-shadow: 0 0 0 10px #4fc3dc44,
	0 0 50px #4fc3dc,
	0 0 100px #4fc3dc;
	margin: 0 4px;
	border-radius: 50%;
	animation: animate 15s linear infinite;
	animation-duration: calc(75s / var(--i));
}
.bubbles span:nth-child(even) 
{
	background: #ff2d75;
	box-shadow: 0 0 0 10px #ff2d7544,
	0 0 50px #ff2d75,
	0 0 100px #ff2d75;
}
@keyframes animate 
{
	0% 
	{
		transform: translateY(100vh) scale(0);
	}
	100% 
	{
		transform: translateY(-10vh) scale(1);
	}
}
,

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