STPace 2020-02-17
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
</style>
</head>
<body>
<div class="father">
<div class="son">son</div>
</div>
</body>
</html>.father {
width: 500px;
height: 500px;
position: relative;
background-color: red;
}
.son {
width: 200px;
height: 200px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -100px;
margin-left: -100px;
background-color: black;
}.father{
width: 1000px;
height: 600px;
position: relative;
background-color: red;
}
.son {
background-color: #fff;
width: 300px;
height: 300px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}.father {
width: 500px;
height: 500px;
display: flex;
justify-content: center;
align-items: center;
background-color: red;
}
.son {
width: 200px;
height: 200px;
background-color: black;
} .father {
width: 500px;
height: 500px;
position: relative;
background-color: red;
}
.son {
width: 200px;
height: 200px;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
background-color: black;
} /*垂直居中,div上边界距离窗口上边的距离为窗口高度的50%,并针对不同浏览器进行兼容。-- 在外层添加一个div,把行内容居中,添加.row .justify-content-center -->
CSS中居中的几种方式1.水平居中margin:0 auto;块级元素在块级元素中居中设置在子元素上,前提是不受float影响。给它的父元素设置text-aglin:center不会使它在父元素中居中