Lower the transparency of a container without affecting the transparency of its elements

Is there a way to decrease the transparency of the page contents container background without affecting the opacity of the actual content?

<div id="container">
   <div id="page contents">
   Insert your amazing articles and more here.
   </div>
</div>

The container needs to be able to expand with the content, so a fixed height won't work.

Absolute positioning below the content would create no relationship between the two divs and prevent it from expanding with the content. Using jQuery is not an option as it may cause lag, so other solutions are preferred.

We could resort to using 'png' background images, but that limits the ability to change colors easily based on different color schemes in the template.

Generating images when needed is a possibility, but not the most ideal solution.

Unfortunately, CSS3 cannot be used due to compatibility issues with Internet Explorer. Any suggestions for this dilemma?

cssopacity

Answer №1

Initially, I am thinking of using a transparent PNG.

However, upon further exploration and considering your mention of variable color schemes, utilizing RGBA support might be more suitable for your needs. You can find a helpful post on this topic (including tips on how to work around IE's lack of support) here:

http://css-tricks.com/rgba-browser-support/

Answer №2

Although it has not been tested yet, the concept is clear.

<div id="container">
   <div id="page contents">
   <div id="opacity"></div>
   page contents goes here, such as remarkable articles and more.
   </div>
</div>

#page {
   position:relative;
}

#opacity {
   position:absolute; z-index:-1; height:100%; width:100%; background-color:#eee; opacity:.7;
}

Answer №3

To solve the issue of an element receiving its opacity value, even when the content's opacity is set to 0, here's a simple solution that can be used:

HTML

<div id="menu_bg"></div> <!-- Background for Left Menu -->
<div id="menu_header">
  <span class="menu_title2">MAIN MENU</span>
  <div id="menu_opts">
    <ul id="menu">
      <li id="menu_home"><a href="#">HomePage</a></li>
      <li id="menu_home"><a href="#">Company</a></li>
    </ul>
  </div>
</div>

The CSS:

div#menu_bg {
  position:fixed; top:10px; left:10px; z-index:20000;
  width:200px; height:50px;
  background:#000000;
  /* for IE */ filter:alpha(opacity=60);
  /*CSS3 standard*/ opacity:0.6;
}
div#menu_header {
  position:fixed; top:10px; left:10px; z-index:20001;
  width:200px; height:50px; overflow:hidden; cursor:pointer;
}
div#menu_opts {
  position:absolute; top:60px; left:10px;
  width:200px; height:275px; overflow:hidden;
}

The key is to use two divs - one as a background with the desired opacity and another for the content placed on top using z-index. This way, the content will appear correctly while achieving the opacity effect on the background.

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