I am using [Symfony2](http://symfony.com/) Bundle [KnpSnappyBundle](https://github.com/KnpLabs/KnpSnappyBundle) to convert an html twig template to a pdf.

[KnpSnappyBundle](https://github.com/KnpLabs/KnpSnappyBundle) is base on [Snappy](https://github.com/KnpLabs/snappy) wrapper, that use [wkhtmltopdf](https://code.google.com/p/wkhtmltopdf/).

My template use [twitter bootstrap](http://getbootstrap.com/2.3.2/) 2.3.2 css like this :

```
<div class="container">
    <div class="row">
        <div class="span12">
            <h4>TITLE</h4>
        </div>
    </div>
    <div class="row">
        <div class="span6" id="customers">
            <h5>TITLE</h5>

            <p>TEXT</p>

            <ul class="unstyled">
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
            </ul>
        </div>
        <div class="span6" id="estimate">
            <h5>TITLE</h5>

            <ul class="unstyled">
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
                <li>LIST ITEM</li>
            </ul>
        </div>
    </div>
</div>

```

Problem : the customers and estimate spans are not on the same line as they should be.
I don't know what is going on.