blocks|key|759419|text|使用将父div移到中间|type|unstyled|depth|inlineStyleRanges|entityRanges|data|759420|left:+50%25;
top:+50%25;
margin-left:+-50px;|code-block|syntax|javascript|759421|将第二层移动到另一层上|759422|position:+relative;
left:+-100px;|759423|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<p>Move the parent div to the middle with</p>

<pre><code>left: 50%;
top: 50%;
margin-left: -50px;
</code></pre>

<p>Move the second layer over the other with</p>

<pre><code>position: relative;
left: -100px;
</code></pre>


blocks|key|759480|text|如果将left和right都设置为零，并将left和right边距设置为auto，则可以将绝对定位的元素居中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|759481|position:absolute;
left:0;
right:0;
margin-left:auto;
margin-right:auto;|code-block|syntax|javascript|759482|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>If you set both left and right to zero, and left and right margins to auto you can center an absolutely positioned element.</p>

<pre><code>position:absolute;
left:0;
right:0;
margin-left:auto;
margin-right:auto;
</code></pre>


blocks|key|759525|text|你所要做的就是确保你的父<div>有position:relative，并为你想要居中的元素设置一个高度和宽度。使用以下CSS：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|759526|.layer+{
++++width:+600px;+height:+500px;
++++display:+block;
++++position:absolute;
++++top:0;
++++left:+0;
++++right:0;
++++bottom:+0;
++++margin:auto;
}|code-block|syntax|javascript|759527|https://output.jsbin.com/aXEZUgEJ/1/|759528|entityMap|0|LINK|mutability|MUTABLE|url^0|C|5|I|H|0|0|0|10|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|M|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|L]]]]

<p>All you have to do is make sure your parent <code>&lt;div&gt;</code> has <code>position:relative</code>, and set a height and width for the element you want centered. Use the following CSS:</p>
<pre><code>.layer {
    width: 600px; height: 500px;
    display: block;
    position:absolute;
    top:0;
    left: 0;
    right:0;
    bottom: 0;
    margin:auto;
}
</code></pre>
<p><a href="https://output.jsbin.com/aXEZUgEJ/1/" rel="nofollow noreferrer">https://output.jsbin.com/aXEZUgEJ/1/</a></p>


blocks|key|759589|text|如果您想在不知道元素的宽度和高度的情况下居中对齐，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|759590|position:+absolute;
top:+50%25;
left:+50%25;
transform:+translate(-50%25,+-50%25);|code-block|syntax|javascript|759591|示例：|759592|​|759593|*{
++margin:0;
++padding:0;
}
section{
++background:red;
++height:+100vh;
++width:+100vw;
}
div{++
++width:+80vw;
++height:+80vh;
++background:+white;
++position:+absolute;
++top:+50%25;
++left:+50%25;
++transform:+translate(-50%25,+-50%25);
}|759594|<section>
++<div>
++++<h1>Popup</h1>
++</div>
</section>|759595|759596|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|T|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|U|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|O|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|Q|$]]

<p>If you want to center align an element without knowing it's width and height do:</p>

<pre><code>position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
</code></pre>

<p>Example: </p>

<p><div class="snippet" data-lang="js" data-hide="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>*{
  margin:0;
  padding:0;
}
section{
  background:red;
  height: 100vh;
  width: 100vw;
}
div{  
  width: 80vw;
  height: 80vh;
  background: white;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;section&gt;
  &lt;div&gt;
    &lt;h1&gt;Popup&lt;/h1&gt;
  &lt;/div&gt;
&lt;/section&gt;</code></pre>
</div>
</div>
</p>


blocks|key|759607|text|position:+absolute;
top:+0;
left:+0;
bottom:+0;
right:+0;
margin:+auto;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|759608|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
margin: auto;
</code></pre>


blocks|key|543018|text|试试这个方法，对我来说效果很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|543019|position:+absolute;
left:+50%25;
transform:+translateX(-50%25);+|code-block|syntax|javascript|543020|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>try this method, working fine for me</p>

<pre><code>position: absolute;
left: 50%;
transform: translateX(-50%); 
</code></pre>


<p>I am trying to stack two canvas together and make it a double layers canvas.</p>

<p>I've saw an example here:</p>

<pre><code>&lt;div style="position: relative;"&gt;
 &lt;canvas id="layer1" width="100" height="100" 
   style="position: absolute; left: 0; top: 0; z-index: 0;"&gt;&lt;/canvas&gt;
 &lt;canvas id="layer2" width="100" height="100" 
   style="position: absolute; left: 0; top: 0; z-index: 1;"&gt;&lt;/canvas&gt;
&lt;/div&gt;
</code></pre>

<p>But i would like to set both of the canvas align at the center of the screen. If i set the value of <code>left</code> as a constant, while I change the orientation of the screen (as I'm doing aps on iPad) the canvas won't remain at the middle of the screen like how it act in </p>

<pre><code>&lt;div align="center"&gt;
</code></pre>

<p>Can anyone help,  please?</p>


How to align absolutely positioned element to center?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试将两个画布堆叠在一起，使其成为一个双层画布。我在这里看到了一个例子：<div style="position: relative;"> <canvas id="layer1" width="100" height="100"    style="position: absolute; left: 0; top...

问如何将绝对定位的元素对齐到中心？
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问如何将绝对定位的元素对齐到中心？
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