元素完全居中

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元素完全居中的方法

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.box{
			display: inline-block;
			width: 400px;
			height: 400px;
			position: relative;
			background: red;
		}
		.box1{
			position: absolute;
			width: 100px;
			height: 100px;
			left: 50%;
			top: 50%;
			margin-left: -50px;
			margin-top: -50px;
			background: #ccc;
		}
		.box2{
			position: absolute;
			width: 100px;
			height: 100px;
			left: 50%;
			top: 50%;
			transform: translate(-50%,-50%);
			background: #ccc;
		}
		.boxc{
			width: 400px;
			height: 400px;
			display: flex;
			align-items: center;
			justify-content: center;
			background: #ccc;
		}
		.box3{
			width: 200px;
			height: 200px;
			border: 1px solid red;
		}
		.box4{
			height: 200px;
			width: 100px;
			margin: auto;
			position: absolute;
			left: 0;
			right: 0;
			top: 0;
			bottom: 0;
			background: #ccc;
			overflow: auto;
		}
		.box4 .cc{
			width: 100px;
			height:50px;
			background: blue;
			position: fixed;
			z-index: 999;
		}
	</style>
</head>
<body>
	<div class="box">
		<div class="box1">
			
		</div>
	</div>
	<div class="box">
		<div class="box2">
			
		</div>
	</div>
	<div class="boxc">
		<div class="box3">
			
		</div>
	</div>
	<div class="box">
		<div class="box4">
			<div class="cc"></div>
		</div>
	</div>
</body>
</html>