<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>关于div居中</title>
</head>
<style type="text/css">
html,
body {
height: 100%;
} .div1 {
width: 60%;
height: 40%;
border: 1px solid #000000;
} .div2 {
width: 40%;
height: 45%;
background-color: green;
}
</style> <body>
<div class="div1">
<div class="div2"> </div>
</div>
</body> </html>
一、绝对定位
.div1 {
position: relative;
}
.div2 {
margin: auto;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
二、translate
.div2 {
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
三、flex
.div1 {
display: flex;
justify-content: center;
align-items: center;
}