Progress bar layout using CSS and HTML

Question

I am trying to achieve UI as shown in the image. However I am having little hard time after trying combinations of positioning now I am clueless. Can someone help me with this?

<style>
    .progress{
        position:relative;
        width:500px;
    }
    .bar{

    }
    .percent{

    }
</style>
<div class="progress">
    <span class="bar" width="%"></span>
    <span class="percent">50%</span>
</div>

Answer 1

HTML:

<div id="progress">
    <span id="percent">30%</span>
    <div id="bar"></div>
</div>

CSS:

#progress {
 width: 500px;   
 border: 1px solid black;
 position: relative;
 padding: 3px;
}

#percent {
 position: absolute;   
 left: 50%;
}

#bar {
 height: 20px;
 background-color: green;
 width: 30%;
}

Sample here: http://jsfiddle.net/WawPr/