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

或者你现在可以使用flex box与位置绝对:

.parent {
    position: relative;
    display: flex;
    justify-content: center;
}

.child {
    position: absolute;
}

2019-11-14 14:17:14

其他回答

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

绝对位置将其从流中取出，并将其放在父元素的0x0处(最后一个块元素具有绝对位置或相对位置)。

我不确定你到底想要完成什么，它可能是最好的设置li到一个位置:相对，这将居中他们。考虑到当前的CSS

请登录http://jsfiddle.net/rtgibbons/ejRTU/玩它

2011-12-14 16:59:55

我最喜欢的绝对居中任何元素或元素组的方法是对它们的容器进行绝对定位，使其成为相对容器的高度和宽度，然后使用flex来对齐其中的元素。

在这种情况下:

body {
  position: relative; /* OPTIONAL */
}

#slideshowWrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: row; /* OPTIONAL IF ONLY ONE ELEMENT */
  justify-content: center;
  align-items: center;
}

希望有帮助，干杯。

2021-05-25 16:30:59

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

    <div class="centered_content"> content </div>
    <style type="text/css">
    .centered_content {
       text-align: center;
       position: absolute;
       left: 0;
       right: 0;
    }
    </style>

参见demo: http://jsfiddle.net/MohammadDayeh/HrZLC/

text-align:中心;工作与位置:绝对元素时添加左:0;右:0;

2014-05-24 01:49:11

如何将“position: absolute”元素居中

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