css“left”不工作

css“left”不工作

问题描述:

我有两个div,父母和子女,我想让那个孩子的左边(左边框)将在父母的中心。

I have 2 divs, parent and child, I want that child left side (left border) will in center of parent.

为什么这个代码不工作? left:50% for child,is not working。

Why this code not working? that is left: 50% for child, is not working.

<div id="outher">
    <div id="inner">

    </div>
</div>

css:

#outher {
   width: 1000px;
   height: 1000px;
   background-color: #ccc;
}

#inner {
   width: 400px;
   height: 300px;
   background-color: #090;
   left: 50%;
}

demo http://jsfiddle.net/vrse2/5/

您需要设置位置到绝对相对

#inner {
   width: 400px;
   height: 300px;
   background-color: #090;
   position: absolute;
   left: 50%;
}