z-index无法正常工作 [英] z-index not working properly
问题描述
所以我在做一个网站,我有一个顶部的酒吧与一些盒阴影。然后我在下面有一个描述框。所以我设置z索引,以确保顶部的框阴影将覆盖具有以下css的描述框:
#topbar {
z-index:9999!important;
}
#description {
margin-top:0px;
z-index:-1!important;
}
jsfiddle
您会注意到,如果您更改 margin-top
,你可以看到阴影隐藏在描述下面!
为什么会发生这种情况,如何解决? / p>
注意:元素不能有固定或绝对定位
position:relative
。 z-index
仅影响定位元素。
更新JSFiddle: http://jsfiddle.net/BAW23/3/
So I am making a site and I have a top bar with some box shadow. I then have a description box directly underneath. So I set the z-indexes to ensure that the top bars box-shadow would go over the description box with the following css:
#topbar{
z-index:9999 !important;
}
#description{
margin-top:0px;
z-index:-1 !important;
}
jsfiddle
you will notice if you change the margin-top
, you can see that the shadow is being hidden underneath the description still!
why is this happening and how can I fix it?
note: neither element can have fixed or absolute positioning
Add position: relative
to both elements. z-index
only affects positioned elements.
Updated JSFiddle: http://jsfiddle.net/BAW23/3/
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