方法一： display:flex
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css_com/reset.css">
<style>
.parents{
/*添加部分*/
display: flex;
align-items: center;
justify-content: center;
margin:0 auto;
width: 600px;
height: 600px;
background-color: #4eff5e;
}
.son{
width: 300px;
height: 300px;
background-color: #ff4236;
}
</style>
</head>
<body>
<div class="parents">
<div class="son"></div>
</div>
</body>
</html>
方法二：display:table-cel
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css_com/reset.css">
<style>
.parents{
/*添加部分*/
display: table-cell;
vertical-align: middle;
margin:0 auto;
width: 600px;
height: 600px;
background-color: #4eff5e;
}
.son{
/*添加部分*/
margin: auto;
width: 300px;
height: 300px;
background-color: #ff4236;
}
</style>
</head>
<body>
<div class="parents">
<div class="son"></div>
</div>
</body>
</html>
方法三：绝对定位和0
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css_com/reset.css">
<style>
.parents{
/*添加部分*/
position: relative;
margin:0 auto;
width: 600px;
height: 600px;
background-color: #4eff5e;
}
.son{
/*添加部分*/
margin: auto;
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
width: 300px;
height: 300px;
background-color: #ff4236;
}
</style>
</head>
<body>
<div class="parents">
<div class="son"></div>
</div>
</body>
</html>
方法四：负边距
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css_com/reset.css">
<style>
.parents{
/*添加部分*/
position: relative;
margin:0 auto;
width: 600px;
height: 600px;
background-color: #4eff5e;
}
.son{
/*添加部分*/
position: absolute;
top: 50%;
left: 50%;
margin-left: -150px;
margin-top: -150px;
width: 300px;
height: 300px;
background-color: #ff4236;
}
</style>
</head>
<body>
<div class="parents">
<div class="son"></div>
</div>
</body>
</html>
方法四：css3属性中的平移
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="../css_com/reset.css">
<style>
.parents{
/*添加部分*/
position: relative;
margin:0 auto;
width: 600px;
height: 600px;
background-color: #4eff5e;
}
.son{
/*添加部分*/
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
width: 300px;
height: 300px;
background-color: #ff4236;
}
</style>
</head>
<body>
<div class="parents">
<div class="son"></div>
</div>
</body>
</html>
目前总结这四种方法，实际使用的时候根据实际情况选取不同的方法
原文：https://www.cnblogs.com/SpringAndMoon/p/12105674.html