Div居中的几种方法，Div absolute居中

<div></div>

// position: relative 居中
div{
	width: 100px;
	height: 100px;
	margin: 0 auto;
	background-color: blue;
}


// position: absolute 居中
div{
	width: 100px;
	height: 100px;
	position: absolute;
	left: 50%;
	margin-left: -50px;
	text-align: center;
	background-color: blue;
}