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纯靠css实现的垂直居中
本文共用的html代码
<div class="box">
<div class="contend">垂直居中</div>
</div>
table-cell 方式
.box{
display: table-cell;
vertical-align: middle;
border: 1px solid #000;
width: 200px;
height: 200px;
text-align: center;
}
.contend{
width: 100px;
margin: 0 auto;
border: 1px solid #000;
}
flex方法
.box{
display: flex;
justify-content: center;
align-items: center;
width: 200px;
height: 200px;
border: 1px solid #000;
}
.contend{
width: 100px;
border: 1px solid #000;
text-align: center;
}
绝对定位加负margin
.box{
position: relative;
width: 200px;
height: 200px;
border: 1px solid #000;
}
.contend{
position: absolute;
top: 50%;
left: 50%;
margin-left: -50px;
margin-top: -50px;
border: 1px solid #000;
text-align: center;
width: 100px;
height: 100px;
line-height: 100px;
}
绝对定位并且各方向为0, margin为auto
.box{
position: relative;
width: 200px;
height: 200px;
border: 1px solid #000;
}
.contend{
position: absolute;
top: 0;
right: 0;
left: 0;
bottom: 0;
margin: auto;
width: 100px;
height: 100px;
line-height: 100px;
border: 1px solid #000;
}
这种方法跟上面的有些类似,但是这里是通过margin:auto
和top,left,right,bottom
都设置为0,实现居中。不过这里得确定内部元素的高度。
CSS3的transform配合绝对定位
.box{
position: relative;
width: 200px;
height: 200px;
border: 1px solid #000;
}
.contend{
position: absolute;
top: 50%;left: 50%;
transform: translate(-50%,-50%);
width: 100px;
height: 100px;
line-height: 100px;
border: 1px solid #000;
}
display:inline-block, 通过:after
来占位
.box{
width: 200px;
height: 200px;
border: 1px solid #000;
text-align: center;
}
.contend{
display: inline-block;
vertical-align: middle;
width: 100px;
height: 100px;
line-height: 100px;
border: 1px solid #000;
}
.box:after{
content: '';
width: 0;
height: 100%;
display: inline-block;
vertical-align: middle;
}