1. 利用text-align实现行内元素居中
行内元素居中就很简单,只需要设置一下元素的text-align和行高
.box {
height: 300px;
width: 300px;
background-color: pink;
margin: 100px auto;
}
.box p {
text-align: center;
line-height: 300px;
}
2.利用定位再结合margin:auto实现
块元素的水平居中利用margin就可以实现,但垂直居中显然不太好实现。
.box {
height: 300px;
width: 300px;
background-color: pink;
margin: 100px auto;
position: relative;
}
.box div {
width: 30px;
height: 30px;
background-color: red;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
3.已知宽高利用负margin和定位配合
.box {
height: 300px;
width: 300px;
background-color: pink;
margin: 100px auto;
position: relative;
}
.box div {
width: 30px;
height: 30px;
background-color: red;
position: absolute;
left: 50%;
top: 50%;
margin-left: -15px;
margin-top: -15px;
}
4. 定位通过计算元素宽高实现居中
<!DOCTYPE html>
<head>
<title>absolute+margin计算元素宽高判断居中</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
.content {
width: 300px;
height: 300px;
border: 1px solid #109D71;
position: relative;
}
.box {
position: absolute;
width: 100px;
height: 100px;
/* top: 50%;
left: 50%;
margin-top: -50px;
margin-left: -50px; */
top: calc(50% - 50px);
left: calc(50% - 50px);
background: #109D71;
}
</style>
</head>
<body>
<div class="content">
<div class="box">
</div>
</div>
</body>
</html>
5.通过translate将元素移动自身的50%
translate(-50%,-50%) 属性:向上(x轴)和左(y轴),移动自身长宽的 50%,使其居于中心位置。
top: 50%;left: 50%;:是以窗口左上角为原点,需要减掉自身宽高的一半,才能居中。
与使用margin实现居中不同的是,margin必须知道自身的宽高,而translate可以在不知道宽高的情况下进行居中,tranlate函数中的百分比是相对于自身宽高的百分比。
<!DOCTYPE html>
<head>
<title>absolute+translate</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
.content {
width: 300px;
height: 300px;
border: 1px solid #109D71;
position: relative;
}
.box {
position: absolute;
width: 100px;
height: 100px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background: #109D71;
}
</style>
</head>
<body>
<div class="content">
<div class="box">
</div>
</div>
</body>
</html>
6.flex 弹性布局实现
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>flex布局</title>
<style>
.content {
width: 300px;
height: 300px;
margin: 50px;
border: 1px solid #109D71;
display: flex;
align-items: center;
justify-content: center;
}
.box{
width: 150px;
height: 150px;
background-color: #109D71;
text-align: center;
margin: 0 auto;
display: flex;
align-items: center;
justify-content: center;
}
</style>
</head>
<body>
<div class="content">
<div class="box">
水平垂直居中
</div>
</div>
</body>
</html>
7.grid网格布局实现
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>flex布局</title>
<style>
.content {
width: 300px;
height: 300px;
margin: 50px;
border: 1px solid #109D71;
display: grid;
place-items: center;
place-content: center;
}
.box {
width: 150px;
height: 150px;
background-color: #109D71;
text-align: center;
margin: 0 auto;
display: grid;
place-items: center;
}
</style>
</head>
<body>
<div class="content">
<div class="box">
水平垂直居中
</div>
</div>
</body>
</html>
8.利用display:table-cell
属性来实现
display:table-cell;
结合vertical-align: middle;
使用实现垂直居中,margin:0 atuo;
可以实现子元素的水平居中。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>table-cell居中</title>
<style type="text/css">
.content{
border: 1px solid blue;
display: table;
margin: 50px auto;
}
.table{
height: 300px;
width: 300px;
display: table-cell;
vertical-align: middle;
border: 1px solid red;
}
.box{
height: 150px;
width: 150px;
background: #109D71;
margin: 0 auto;
display: table;
}
.word{
display: table-cell;
vertical-align: middle;
text-align: center;
}
</style>
</head>
<body>
<div class="content">
<div class="table">
<div class="box">
<div class="word">
垂直水平居中
</div>
</div>
</div>
</div>
</body>
</html>
以上八种方法均可以实现水平垂直居中对齐,具体实现方法根据情况而使用!