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New Background CSS Opacity Solution.

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Author Topic: New Background CSS Opacity Solution.  (Read 1487 times)
Darksat
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« on: April 29, 2009, 02:20:34 pm »

Just found a new way of making the background of a div opaque using  CSS opacity.The normal problem when using CSS opacity is that when you apply it to a div it makes everything in that div and its child divs transparent.  And before you ask,  No you cant increasethe opacity of the child element again.

So if you have a div with opacity set to 50%, everything inside that div will be set to 50% as well. If you set the opacity of the child element to 70% it will end up with a 35% opacity.

There were a few solutions recently, none of them very good, having a series of absolute positioned divs floating over each other was a popular one, another was using PNG images.

However now there is a new solution, and its very simple to implement. All you do is put position:relative on the div with the content and set overflow to hidden, then you put a second empty div inside the first, specify position:absolute;top:0;left:0; width:100%; height:100%; z-index:-1;and set the opacity of that div as whatever you want.

EG:
Code:
<html><head>

<style type="text/css">

.fade {position:relative;overflow:hidden;}
.fadebg {position:absolute;top:0;left:0;display:block;width:100%;height:100%;z-index:-1;
background:your-background;-moz-opacity:.50; filter:alpha(opacity=50); opacity:.50;}
</style>

</head><body>

<div class="fade"><div class="fadebg"></div>
Content of fade div
</div>
</body>
</html>



« Last Edit: April 29, 2009, 02:23:47 pm by Darksat » Report Spam   Logged

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Defcon 5
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« Reply #1 on: April 29, 2009, 02:36:12 pm »

I was looking for something like that, their seemed to be a long and heated discussion on a forum about this and only resolution was png's!
« Last Edit: April 29, 2009, 02:38:08 pm by Defcon 5 » Report Spam   Logged
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« Reply #2 on: April 29, 2009, 03:01:40 pm »

Yeah I just realised something today and it just clicked.
Guess that puts me up at the top of the CSS guru catagory.
 Grin
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« Reply #3 on: May 02, 2009, 01:04:36 am »

I would venture the thought to call you a guru of css now that you know how to do that, it seems simple to me now but when I needed it I couldn't even consider it being possible!!  Shocked
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