css扫描识别动画效果

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>css扫描动画</title>
<style>
	* {
	margin:0;
	padding:0;
	box-sizing:border-box;
}
body {
	height:100vh;
	position:relative;
}
.scan {
	width:150px;
	height:150px;
	position:absolute;
	left:50%;
	top:50%;
	transform:translate(-50%,-50%);
	backface-visibility:hidden;
}
.scan span {
	position:absolute;
	left:0;
	top:0;
	width:100%;
	height:20px;
	background-color:#00bc12;
	z-index:1;
	transform:translateY(135%);
	animation:move 0.7s cubic-bezier(0.15,0.44,0.76,0.64);
	animation-iteration-count:infinite;
}
.scan > div {
	z-index:1;
	position:absolute;
	left:50%;
	top:50%;
	transform:translate(-50%,-50%);
	width:100%;
	backface-visibility:hidden;
}
.scan i {
	display:block;
	height:1px;
	background:#b04b4b;
	margin:0 auto 2px;
	margin:0 auto 2.2px;
	backface-visibility:hidden;
}
.scan i:nth-child(2) {
	width:75%;
}
.scan i:nth-child(3) {
	width:81%;
}
.scan i:nth-child(4) {
	width:87%;
}
.scan i:nth-child(6) {
	width:71%;
}
.scan i:nth-child(7) {
	width:81%;
}
.scan i:nth-child(8) {
	width:65%;
}
.scan i:nth-child(9) {
	width:83%;
}
.scan i:nth-child(10) {
	width:75%;
}
.scan i:nth-child(12) {
	width:86%;
}
.scan i:nth-child(14) {
	width:65%;
}
.scan i:nth-child(16) {
	width:75%;
}
.scan i:nth-child(18) {
	width:83%;
}
.scan:before,.scan:after,.scan em:after,.scan em:before {
	border-color:#b04b4b;
	content:"";
	position:absolute;
	width:19px;
	height:16px;
	border-style:solid;
	border-width:0px;
}
.scan:before {
	left:0;
	top:0;
	border-left-width:1px;
	border-top-width:1px;
}
.scan:after {
	right:0;
	top:0;
	border-right-width:1px;
	border-top-width:1px;
}
.scan em:before {
	left:0;
	bottom:0;
	border-left-width:1px;
	border-bottom-width:1px;
}
.scan em:after {
	right:0;
	bottom:0;
	border-right-width:1px;
	border-bottom-width:1px;
}
@keyframes move {
	0%,100% {
	transform:translateY(270%);
}
50% {
	transform:translateY(0%);
}
75% {
	transform:translateY(672%);
}
}
</style>

</head>

<body>
	<div class="scan">
		<em></em>
		<div>
			<i></i><i></i><i></i><i></i><i></i><i></i><i></i>
			<i></i><i></i><i></i><i></i><i></i><i></i><i></i>
			<i></i><i></i><i></i>
		</div>
		<span></span>
	</div>
</body>
</html>

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