CSS div opacity only on outer div

Question

I've got two divs, the outer and the inner div. I have a background image and the outer div has an opacity set however i just cannot seem to get the inner div to not inherit the opacity of outer div. i would like the inner div to be a solid colour.

my code is below and a jsfiddle here: http://jsfiddle.net/3TK3U/

<style type="text/css">

body
{
background-image:url('http://media-bubble.info/images/layout/background.png');
}

.outsideBox {
    width:70%;
    height:200px;
    background-color: #ffffff;
    opacity:0.7; 
    filter:alpha(opacity=70);
    text-align:center;
}

.insideBox {
    width:40%;
    height:80px;
    background-color: #999;
    z-index:999999;
}

</style>


<div id="Introduction" class="outsideBox">
    <div id="Introduction" class="insideBox">This is the inside box which should not inherit transparancy</div>
</div>

Answer 1

Try using background-color: rgba(255,255,255,0.7); with no opacity or filter that should make the background transparent but not effect the contents of the element.