通过给需要居中的元素加入如下属性:使用此种方法,该元素会相对第一个具有定位环境的父元素居中
position: absolute; left: 0; top: 0; bottom: 0; right: 0; margin: auto;
示例代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.fat{
width: 500px;
height: 500px;
border: solid 1px black;
position: relative;
}
.sub{
width: 100px;
height: 100px;
border: solid 1px red;
position: absolute;
left: 0;
top: 0;
bottom: 0;
right: 0;
margin: auto;
}
</style>
</head>
<body>
<div class="fat">
<div class="sub"></div>
</div>
</body>
</html>
来源:https://www.cnblogs.com/huwt/p/10947197.html