如何将“position: absolute”元素居中

我有一个问题，居中有一个元素的属性位置设置为绝对。有人知道为什么这些图像没有居中吗?

body { text-align: center; } #slideshowWrapper { margin-top: 50px; text-align: center; } ul#slideshow { list-style: none; position: relative; margin: auto; } ul#slideshow li { position: absolute; } ul#slideshow li img { border: 1px solid #ccc; padding: 4px; height: 450px; } <body> <div id="slideshowWrapper"> <ul id="slideshow"> <li><img src="https://source.unsplash.com/random/300*300?technology" alt="Dummy 1" /></li> <li><img src="https://source.unsplash.com/random/301*301?technology" alt="Dummy 2" /></li> </ul> </div> </body>

当前回答

在CSS中，居中一些绝对定位的东西是相当复杂的。

ul#slideshow li {
    position: absolute;
    left:50%;
    margin-left:-20px;

}

将左边距更改为要居中的元素宽度的一半(负)。

2011-12-14 16:52:50

其他回答

对于这种情况，我认为下面的代码就足够了:

    ul#slideshow li {
      position: absolute;
      left: 0;
      right: 0;
    }

2021-09-04 01:08:18

如果你不知道元素的宽度，你可以使用下面的代码:

<body>
<div style="position: absolute; left: 50%;">
    <div style="position: relative; left: -50%; border: dotted red 1px;">
        I am some centered shrink-to-fit content! <br />
        tum te tum
    </div>
</div>

演示在小提琴:http://jsfiddle.net/wrh7a21r/

来源:https://stackoverflow.com/a/1777282/1136132

2014-12-30 18:32:01

要居中一个位置:绝对属性，你需要设置left:50%和margin-left: -50%的div宽度。

<!-- for horizontal -->
<style>
div.center{
 width:200px;
 left:50%;
 margin-left:-100px;
 position:absolute;
}
</style>


<body>
 <div class='center'>
  should be centered horizontaly
 </div>
</body>

对于垂直中心绝对，你需要做同样的事情，而不是用左边，只是用顶部。 (注意:html和body必须有min-height 100%;)

<!-- for vertical -->
<style>
 body,html{
  min-height:100%;
 }
 div.center{
  height:200px;
  top:50%;
  margin-top:-100px;
  position:absolute;
 }
</style>

<body>
 <div class='center'>
  should be centered verticaly
 </div>
</body>

并且可以两者结合使用

   <!-- for both -->
 <style>
 body,html{
  min-height:100%;
 }
 div.center{
  width:200px;
  height:50px
  left:50%;
  top:50%;
  margin-left:-100px;
  margin-top:-25px;
  position:absolute;
 }
</style>


<body>
 <div class='center'>
  should be centered
 </div>
</body>

2011-12-14 17:02:02

相对对象中的绝对对象是相对于它的父对象的，这里的问题是你需要一个静态宽度容器#slideshowWrapper，其余的解决方案就像其他用户说的

body {
    text-align: center;
}

#slideshowWrapper {
    margin-top: 50px;
    text-align:center;
    width: 500px;
}

ul#slideshow {
    list-style: none;
    position: relative;
    margin: auto;
}

ul#slideshow li {
    position: relative;
    left: 50%;
}

ul#slideshow li img {
    border: 1px solid #ccc;
    padding: 4px;
    height: 450px;
}

http://jsfiddle.net/ejRTU/10/

2011-12-14 17:06:57

我不确定你想要完成什么，但在这种情况下，只是增加宽度:100%;到你的ul#slideshow li将做的把戏。

解释

The img tags are inline-block elements. This means that they flow inline like text, but also have a width and height like block elements. In your css there are two text-align: center; rules applied to the <body> and to the #slideshowWrapper (which is redundant btw) this makes all inline and inline-block child elements to be centered in their closest block elements, in your code these are li tags. All block elements have width: 100% if they are the static flow (position: static;), which is default. The problem is that when you tell li tags to be position: absolute;, you take them out of normal static flow, and this causes them to shrink their size to just fit their inner content, in other words they kind of "lose" their width: 100% property.

2016-01-25 19:41:19

如何将“position: absolute”元素居中

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