如何让 box-shadow 出现在 div 上方? [英] How can I make box-shadow appear above a div?
问题描述
这里是我想要完成的一个例子.
上方 div
的 box-shadow
不会出现在其下方 div
的顶部.据我所知,我需要设置 z-index
以便它会出现在顶部,并且只适用于具有 position: relative;
的元素,但它仍然没有出现.
我做错了什么?
#top {宽度:100%;高度:100px;框阴影:3px 3px 3px #333;背景颜色:蓝色;}#中间 {宽度:100%;高度:200px;z-索引:0;位置:相对;背景颜色:橙色;}#innerMiddle {宽度:200px;高度:200px;边距:0 自动;背景颜色:绿色;}
<div id="中间"><div id="innerMiddle">
它是 #top
和它的 box-shadow
你想要出现在顶部,所以给它position:relative
而不是将 position:relative
赋予 #middle
.不需要 z-index: 0
.
http://jsfiddle.net/thirtydot/QqME6/1/
Here is an example of what I'm trying to accomplish.
The box-shadow
from the upper div
won't appear on top of the div
below it. From what I understand, I need to set the z-index
so it will appear on top and that only works on elements with position: relative;
but it's still not appearing.
What am I doing wrong?
#top {
width: 100%;
height: 100px;
box-shadow: 3px 3px 3px #333;
background-color: blue;
}
#middle {
width: 100%;
height: 200px;
z-index: 0;
position: relative;
background-color: orange;
}
#innerMiddle {
width: 200px;
height: 200px;
margin: 0 auto;
background-color: green;
}
<div id="top">
</div>
<div id="middle">
<div id="innerMiddle">
</div>
</div>
It's #top
and its box-shadow
that you want to appear on top, so give that position: relative
instead of giving position: relative
to #middle
. There's no need for z-index: 0
.
http://jsfiddle.net/thirtydot/QqME6/1/
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