Strange z-index behavior with scrollbars under Chrome

Question

Using z-index CSS property on 'fixed' positioned elements gives me a strange behavior under Chrome.

When Firefox and Opera browsers give me the awaited result, Chrome does not seem to respect the z-index property, displaying the scrollbar above the red overlay (see code and Fiddle bellow).

HTML:

<div class="left">     <div class="placeholder"></div> </div> <div class="right"></div> <div class="overlay"></div> 

CSS:

.left {     background-color: yellow;     bottom: 0;     left: 0;     overflow: auto;     position: fixed;     top: 0;     width: 35%;     z-index: 10; }  .right {     background-color: orange;     bottom: 0;     position: fixed;     right: 0;     top: 0;     width: 65%;     z-index: 20; }  .overlay {     background-color: red;     bottom: 20%;     left: 25%;     position: fixed;     right: 25%;     top: 20%;     z-index: 40; }  .placeholder {     height: 3000px; } 

Example: http://jsfiddle.net/kvNFW/

OS: Apple Mac OS 10.8 Google Chrome: Version 27.0.1453.93

Is there someone having experienced the same issues, or having a way to fix that?

Thanks in advance for any help.

Edit:

See this screenshot for an overview of the issue.

Answer 1

You may try to add -webkit-transform: translate3d(0, 0, 0). It solves my similar problem happened in mobile chrome.

Answer 2

I had some similar issues, and the only way to resolve I found was to apply some special styles to the webkit scrollbar in order to show it always. See http://jsfiddle.net/sinspiral/pTkQL/ with your example fixed.

This is not platform compatible (as on windows it will apply those styles too), so you might need to find a way, maybe js, to detect on which OS it is running.

.left::-webkit-scrollbar{    -webkit-appearance: none; }  .left::-webkit-scrollbar-thumb {     background-color: rgba(50, 50, 50, .5);     border: 3px solid transparent;     border-radius: 9px;     background-clip: content-box; }  .left::-webkit-scrollbar-track {     background-color: rgba(100, 100, 100, .5);     width: 15px; }