垂直居中另一个 div 内的 div [英] Vertically centering a div inside another div
问题描述
我想将添加到另一个 div 中的 div 居中.
<div id="innerDiv">
这是我目前使用的 CSS.
#outerDiv {宽度:500px;高度:500px;位置:相对;}#innerDiv {宽度:284px;高度:290px;位置:绝对;顶部:50%;左:50%;边距顶部:-147px;左边距:-144px;}
如您所见,我现在使用的方法取决于 innerDiv
的宽度和高度值.如果宽度/高度发生变化,我将不得不修改 margin-top
和 margin-left
值.是否有任何通用的解决方案可以用来独立于 innerDiv
的大小来居中?
我发现使用 margin: auto
可以将 innerDiv 水平对齐到中间.但是垂直对齐中间呢?
垂直对齐中间有效,但您必须在父元素上使用 table-cell
,在子元素上使用 inline-block
.
此解决方案不适用于 IE6 &7.
对于那些人来说,你的方法更安全.
但是由于您使用 CSS3 和 HTML5 标记了您的问题,我认为您不介意使用现代解决方案.
经典解决方案(表格布局)
这是我最初的回答.它仍然可以正常工作,并且是获得最广泛支持的解决方案.表格布局将 影响您的渲染性能 所以我建议您使用一种更现代的解决方案.
<小时>测试:
- FF3.5+
- FF4+
- Safari 5+
- Chrome 11+
- IE9+
HTML
<div class="cn"><div class="inner">您的内容</div></div>
CSS
.cn {显示:表格单元格;宽度:500px;高度:500px;垂直对齐:中间;文本对齐:居中;}.内{显示:内联块;宽度:200px;高度:200px;}
<小时>
现代解决方案(转换)
由于转换现在得到了很好的支持,因此有一种更简单的方法可以做到.
CSS
.cn {位置:相对;宽度:500px;高度:500px;}.内{位置:绝对;顶部:50%;左:50%;变换:翻译(-50%,-50%);宽度:200px;高度:200px;}
<小时>♥ 我最喜欢的现代解决方案 (flexbox)
我开始越来越多地使用 flexbox 它现在也得到了很好的支持这是迄今为止最简单的方法.
CSS
.cn {显示:弹性;对齐内容:居中;对齐项目:居中;}
更多例子 &可能性:比较一页上的所有方法
I want to center a div which is added inside another div.
<div id="outerDiv">
<div id="innerDiv">
</div>
</div>
This is the CSS I am currently using.
#outerDiv {
width: 500px;
height: 500px;
position: relative;
}
#innerDiv {
width: 284px;
height: 290px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -147px;
margin-left: -144px;
}
As you can see, the approach I use now depends on values for width and height of innerDiv
. If the width/height changes, I will have to modify the margin-top
and margin-left
values. Is there any generic solution that I can use to center the innerDiv
independently of its size?
I figured out that using margin: auto
can horizontally align the innerDiv to the middle. But what about vertical align middle?
Vertical align middle works, but you will have to use table-cell
on your parent element and inline-block
on the child.
This solution is not going to work in IE6 & 7.
Yours is the safer way to go for those.
But since you tagged your question with CSS3 and HTML5 I was thinking that you don't mind using a modern solution.
The classic solution (table layout)
This was my original answer. It still works fine and is the solution with the widest support. Table-layout will impact your rendering performance so I would suggest that you use one of the more modern solutions.
Tested in:
- FF3.5+
- FF4+
- Safari 5+
- Chrome 11+
- IE9+
HTML
<div class="cn"><div class="inner">your content</div></div>
CSS
.cn {
display: table-cell;
width: 500px;
height: 500px;
vertical-align: middle;
text-align: center;
}
.inner {
display: inline-block;
width: 200px; height: 200px;
}
Modern solution (transform)
Since transforms are fairly well supported now there is an easier way to do it.
CSS
.cn {
position: relative;
width: 500px;
height: 500px;
}
.inner {
position: absolute;
top: 50%; left: 50%;
transform: translate(-50%,-50%);
width: 200px;
height: 200px;
}
♥ my favourite modern solution (flexbox)
I started to use flexbox more and more its also well supported now Its by far the easiest way.
CSS
.cn {
display: flex;
justify-content: center;
align-items: center;
}
More examples & possibilities: Compare all the methods on one pages
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