Css-Horizontal-vertical-center

七种css方式让一个容器水平垂直居中

方法一:position加margin

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap {
width: 200px;
height: 200px;
background: yellow;
position: relative;
}
.wrap .center {
width: 100px;
height: 100px;
background: green;
margin: auto;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
}

兼容性:主流浏览器均支持,IE6不支持

方法二: diaplay:table-cell

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap{
width: 200px;
height: 200px;
background: yellow;
display: table-cell;
vertical-align: middle;
text-align: center;
}
.center{
display: inline-block;
vertical-align: middle;
width: 100px;
height: 100px;
background: green;
}

兼容性:由于display:table-cell的原因,IE67不兼容

方法三:position加 transform

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap {
position: relative;
background: yellow;
width: 200px;
height: 200px;}
.center {
position: absolute;
background: green;
top:50%;
left:50%;
-webkit-transform:translate(-50%,-50%);
transform:translate(-50%,-50%);
width: 100px;
height: 100px;
}

兼容性:ie9以下不支持 transform,手机端表现的比较好。

方法四:flex;align-items: center;justify-content: center

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap {
background: yellow;
width: 200px;
height: 200px;
display: flex;
align-items: center;
justify-content: center;
}
.center {
background: green;
width: 100px;
height: 100px;
}

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方法五:display:flex;margin:auto

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap {
background: yellow;
width: 200px;
height: 200px;
display: flex;
}
.center {
background: green;
width: 100px;
height: 100px;
margin: auto;
}

移动端首选

方法六:纯position

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<div class="wrap">
<div class="center"></div>
</div>
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.wrap {
background: yellow;
width: 200px;
height: 200px;
position: relative;
}
/**方法一**/
.center {
background: green;
position: absolute;
width: 100px;
height: 100px;
left: 50px;
top: 50px;
}
/**方法二**/
.center {
background: green;
position: absolute;
width: 100px;
height: 100px;
left: 50%;
top: 50%;
margin-left:-50px;
margin-top:-50px;
}

兼容性:适用于所有浏览器
方法六中的方法一计算公式如下:

子元素(conter)的left值计算公式:left=(父元素的宽 - 子元素的宽 ) / 2=(200-100) / 2=50px; 子元素(conter)的top值计算公式:top=(父元素的高 - 子元素的高 ) / 2=(200-100) / 2=50px;

方法二计算公式:
left值固定为50%;
子元素的margin-left= -(子元素的宽/2)=-100/2= -50px;
top值也一样,固定为50%

子元素的margin-top= -(子元素的高/2)=-100/2= -50px

方法七:兼容低版本浏览器,不固定宽高

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<div class="table">
<div class="tableCell">
<div class="content">不固定宽高,自适应</div>
</div>
</div>
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.table {
height: 200px;/*高度值不能少*/
width: 200px;/*宽度值不能少*/
display: table;
position: relative;
float:left;
background: yellow;
}
.tableCell {
display: table-cell;
vertical-align: middle;
text-align: center;
*position: absolute;
padding: 10px;
*top: 50%;
*left: 50%;
}
.content {
*position:relative;
*top: -50%;
*left: -50%;
background: green;
}