块元素，且宽和高已知
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
html, body, .father {
100%;
height: 100%;
}
.father {
position: relative;
}
.child {
/* 使用绝对定位 */
position: absolute;
left: 50%;
top: 50%;
/* 盒子宽和高的一半 */
margin-left: -150px;
margin-top: -150px;
300px;
height: 300px;
background-color: lightblue;
}
</style>
</head>
<body>
<div class="father">
<div class="child"></div>
</div>
</body>
</html>
块元素，且宽和高未知
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
html, body, .father {
100%;
height: 100%;
}
.father {
position: relative;
}
.child {
position: absolute;
left: 50%;
top: 50%;
/* 偏移50% */
transform: translateX(-50%) translateY(-50%);
300px;
height: 300px;
background-color: lightblue;
}
</style>
</head>
<body>
<div class="father">
<div class="child"></div>
</div>
</body>
</html>
flex布局
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
html, body, .father {
100%;
height: 100%;
}
.father {
display: flex;
justify-content: center;
align-items: center;
}
.child {
300px;
height: 300px;
background-color: lightblue;
}
</style>
</head>
<body>
<div class="father">
<div class="child"></div>
</div>
</body>
</html>
margin:auto
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
html, body, .father {
100%;
height: 100%;
}
.father {
position: relative;
}
.child {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
300px;
height: 300px;
background-color: lightblue;
}
</style>
</head>
<body>
<div class="father">
<div class="child"></div>
</div>
</body>
</html>
行内元素居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.father {
500px;
height: 500px;
background-color: #cccccc;
}
.father {
text-align: center;
line-height: 500px;
}
.child {
font-size: 26px;
color: #f40;
display: inline-block;
}
</style>
</head>
<body>
<div class="father">
<div class="child">一朵菊花，一个小鬼</div>
</div>
</body>
</html>
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版权声明：本文为CSDN博主「亦是木子也是雨」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_44162474/article/details/106626269