<div class="container">
        <div class="col col-20">
            <div class="item">L1</div>
            <div class="item">L2</div>
            <div class="item">L3</div>
        </div>
        <div class="col col-60">
            <div class="item">Main</div>
            <div class="item main-content">
                Column Layout using float
                <div id="htmlcode"></div>
            </div>
        </div>  
        <div class="col col-20">
            <div class="item">R1</div>
            <div class="item">R2</div>
        </div> 
        <div style="clear:both;"></div>
        after columns inside container
    </div>