<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>垂直居中</title>
<style>
/* 方法5 */
.outer{
position: relative;
height: 300px;
width: 300px;
display: flex;
border: 1px solid #6A5ACD;
}
.inner{
height: 200px;
width: 200px;
margin: auto;
background: salmon;
}
/* 方法4 */
/* .outer{
position: relative;
height: 300px;
width: 300px;
border: 1px solid #6A5ACD;
}
.inner{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-100px,-100px);
height: 200px;
width: 200px;
background: salmon;
} */
/* 方法3 */
/* .outer{
position: relative;
height: 300px;
width: 300px;
border: 1px solid #6A5ACD;
}
.inner{
position: absolute;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -100px;
height: 200px;
width: 200px;
background: salmon;
} */
/* 方法2 */
/* .outer{
position: relative;
height: 300px;
width: 300px;
display: flex;
align-items: center;
justify-content: center;
border: 1px solid #6A5ACD;
}
.inner{
height: 200px;
width: 200px;
background: salmon;
} */
/* 方法1 */
/*.outer{
position: relative;
height: 300px;
width: 300px;
border: 1px solid #6A5ACD;
}
.inner{
height: 200px;
width: 200px;
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
margin: auto;
background: salmon;
} */
</style>
</head>
<body>
<div class="outer">
<div class="inner">inner</div>
</div>
</body>
</html>
