Center a column using Twitter Bootstrap 3

For Exampple, Center a column using Twitter Bootstrap 3...

Demo

HTML

<div class="container">
        <div class="row">
                <div class="col-sm-6 col-sm-offset-3 div-class"></div>
        </div>
</div>

CSS

<style>
        .div-class { 
                border:solid 1px red; height:60px; 
        }
</style>