Right Column Floating Problem

http://stackoverflow.com/questions/10208436/how-to-position-this-element-fixed

HTML

<a href='#' class='test'>Test lien</a>
<section id='idtest'>
    blab
    blab
</section>

CSS

#container {
    min-width:300px;
    background-color:black;
    height:300px;
    width:100%
}
#lCol{
    width:150px;
    background-color:red;
    float:left;
}
#rCol{
    width:150px;
    background-color:green;
    float:left;
}
section
{
    border:outset 5px;
    border-radius : 10px;
    margin-right:50px;
    margin-left:170px;
    border-color:#999;
}
.test
{
    font-style:italic;
    color:#000;
}