以下面的模板为例，通过 CSS 让盒子居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
.container {
background-color: darkorange;
width: 500px;
height: 500px;
}
.content {
background-color: cyan;
width: 200px;
height: 200px;
}
</style>
</head>
<body>
<div class="container">
<div class="content"></div>
</div>
</body>
</html>定位布局
.container {
position: relative;
}
.content {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}定位+移动布局
.container {
position: relative;
}
.content {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}flex 布局
.container {
display: flex;
justify-content: center;
align-items: center;
}grid 布局
.container {
display: grid;
align-items: center;
justify-items: center;
}inline-block 布局
.container {
text-align: center;
line-height: 500px;
}
.content {
display: inline-block;
vertical-align: middle;
}table-cell 布局
.container {
display: table-cell;
vertical-align: middle;
}
.content {
margin: auto;
}