<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> <style type="text/css"> </style> </head> <body> <div class="father"> <div class="son">1111</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;
}
原文：https://www.cnblogs.com/CatcherLJ/p/11171900.html