Stacked bar chart - http://jsfiddle.net/9pXpU/

CSS

.colWrapper{
    height:200px;
    width:100px;
    position:relative;
    border:1px solid #ccc;
    float:left;
}
.barContainer{
    position:absolute;
    bottom:0;
    width:100%;
}
.bar{
    widith:100%;
    height:20px;    
}
​

HTML

<div class="colWrapper">
    <div class="barContainer">
        <div class="bar" style="background-color:#b4cde2;"></div>
        <div class="bar" style="background-color:#7ca7cc;"></div>
        <div class="bar" style="background-color:#6094c1;"></div>
        <div class="bar" style="background-color:#3b6d97;"></div>
    </div>
</div>
<div class="colWrapper">
    <div class="barContainer">
        <div class="bar" style="background-color:#b4cde2;"></div>
        <div class="bar" style="background-color:#7ca7cc;"></div>
        <div class="bar" style="background-color:#6094c1;"></div>
        <div class="bar" style="background-color:#3b6d97;"></div>
    </div>
</div>
​