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如何让一个盒子垂直居中

2017-07-11 00:57 399 查看
方法1:宽度和高度已知的。

思路:

给父元素相对定位

给子元素绝对定位

left: 50%;top: 50%;

margin-left: 负的宽度一半。

margin-top: 负的高度一半;

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>居中</title>
<style type="text/css">
#box{
width: 400px;
height: 200px;
position: relative;
background: red;
}
#box1{
width: 200px;
height: 100px;
position: absolute;
top: 50%;
left: 50%;
margin-left: -100px;
margin-top: -50px;
background: green;
}
</style>
</head>
<body>
<div id="box">
<div id="box1">

</div>
</div>
</body>
</html>


方法2:宽度和高度自己未知

意思就是说子盒子本身还是有宽度和高度的,只是自己未知。

思路:

给父盒子相对定位

给子盒子绝对定位

top、right、bottom、left全为0

margin: auto;

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>居中</title>
<style type="text/css">
#box{
width: 800px;
height: 400px;
position: relative;
background: red;
}
#box1{
width: 100px;
height: 50px;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
background: green;
}
</style>
</head>
<body>
<div id="box">
<div id="box1">

</div>
</div>
<script type="text/javascript">

</script>
</body>
</html>


方法3:flex布局

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>垂直居中</title>
<style type="text/css">
.box{
width: 400px;
height: 200px;
background: #f99;
}
.box1{
width: 200px;
height: 100px;
background: green;
}
.center{
display: flex;
justify-content: center;
align-items: center;
}
</style>
</head>
<body>
<div class="box center">
<div class="box1">

</div>
</div>
</body>
</html>


方法四:平移

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>css3让一个盒子居中</title>
<style type="text/css">
.parent_box{
width: 400px;
height: 200px;
background: red;
position: relative;
}
.child_box{
width: 200px;
height: 100px;
background: #9ff;
position: absolute;
top: 50%;
left: 50%;
transform: translate( -50%,-50%);
}
</style>
</head>
<body>
<div class="parent_box">
<div class="child_box">

</div>
</div>
</body>
</html>
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