1. 把父元素转换成表格用vertical:middle
垂直居中,子元素转换成行内块用text-aligin:center
居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.father {
height: 500px;
width: 500px;
background-color: hotpink;
display: table-cell;
vertical-align: middle;
text-align: center;
margin: 0 auto;
}
.son {
display: inline-block;
vertical-align: middle;
height: 300px;
width: 80px;
background-color: pink;
}
</style>
</head>
<div class="father">
<div class="son"></div>
</div>
</html>
2. 用C3的transform实现居中 (定位之后走一半的左和上,然后再用transform去走自身的一半)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.father {
height: 500px;
width: 500px;
background-color: hotpink;
position: relative;
}
.son {
height: 100px;
width: 100px;
background-color: yellow;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%)
}
</style>
</head>
<div class="father">
<div class="son"></div>
</div>
</html>
3. 利用flex布局(最简单的方式)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.father {
height: 500px;
width: 500px;
background-color: hotpink;
display: flex;
justify-content: center;
align-items: center;
}
.son {
height: 100px;
width: 100px;
background-color: yellow;
}
</style>
</head>
<div class="father">
<div class="son"></div>
</div>
</html>