What's the best way to layer a fixed div over an absolutely positioned div?

I am in the process of developing a small web application. In this project, I have two div elements - one is set to absolute positioning and the other to static positioning. My goal is to position the static div on top of the absolute div, ensuring that it remains visually dominant.

Below is a simple code example:

http://jsbin.com/efuxe3/edit

How can I achieve this effect?

Edit: I have attempted to use z-index for this purpose, but unfortunately, it does not seem to be having any impact.

Answer №1

z-index is not effective on elements with a static position.

As stated on this website:

This property determines the stacking order of a box when its position value is set to either absolute, fixed, or relative.

If you change your div to have a relative position instead, you can utilize z-index to control the layering.

position: relative places the element in relation to its default (static) position, so if top, bottom, left, or right are not specified, there will be no distinction between static and relative except for the fact that relative enables the use of z-index to adjust the stacking order of the element.

Edit: taking into account your code snippet, here's a functional demo found at this link.

Edit 2: another suggestion from Nathan D. Ryan in the comments suggests applying a negative z-index to your absolutely-positioned div. This action would push it behind any other content on the page lacking a lower defined z-index.

Answer №2

Instead of overlapping the statically positioned element with the absolutely positioned element, you have the option to place the absolutely positioned element behind the statically positioned element. Achieve this by assigning a negative value to the z-index of the absolutely positioned element. Keep in mind that, as noted by @City, doing so will also push the absolutely positioned element behind all other elements in the standard flow of the document.

Answer №3

To place other elements behind the static div, try applying a negative z-index to them. You can do this directly on the elements or use the following code:

*:not(connectedObjects){
    z-index:-1000000000000000000000000000;
  }

Keep in mind that this method may not work in Internet Explorer.

Answer №4

To enhance the structure of your layout, consider introducing a second absolutely positioned division to encompass your statically placed elements:

<div id="container">
   <div class="underlay">
      I hope for this content to be displayed beneath my fixed items.
   </div>

   <div class="item_container">
       <div class="item">blah</div>
       <div class="item">yada</div>
       <div class="item">foo</div>
       <div class="item">bar</div>
   </div>
</div>           

Below is the corresponding CSS:

.underlay {
   position: absolute;
   z-index: 0;
}

.item_container {
   position:absolute;
   z-index:10;
   top: 0;
   left: 0;
   height: 100%;
   width: 100%;
}

.item {
   position: static;
}

Answer №5

If you're referring to the top in terms of z-Index, simply adjust the style of the div by setting a higher z-index value.

div.someClassName {
   z-Index:90;
}

Update:

To modify the z-index of your div using absolute positioning with a negative value, keep in mind that this adjustment will need to be applied to other elements as well.

If there isn't a strong justification for using static positioning, consider switching it to relative so that the z-index can take effect. I have tested this approach in your code snippet and it functions correctly.

Answer №6

Utilize the z-index property to control stacking order. Ensure that the object you want to appear in front has a higher z-index than the others.

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