<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="parent">
<div class="child">
</div>
</div>
------
<div class="parent1">
<div class="child1">
</div>
</div>
------
<div class="parent2">
<div class="child2">
</div>
</div>
<style>
.parent {
width: 500px;
height: 500px;
border: 1px solid red;
position: relative;
}
.child {
width: 400px;
height: 400px;
border: 1px solid green;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
.parent1 {
width: 500px;
height: 500px;
border: 2px solid red;
display: flex;
justify-content: center;
align-items: center;
}
.child1 {
width: 400px;
height: 400px;
border: 2px solid green;
}
.parent2{
width: 500px;
height: 500px;
border: 2px solid red;
display: table-cell;
vertical-align: middle;
}
.child2{
width: 200px;
height: 200px;
border: 2px solid green;
margin: auto;
}
</style>
</body>
</html>
这三种在工作中完全够用了 至于还有其他的 懒得了解了
