Get centered content using Twitter bootstrap

For Example, How do you get centered content using Twitter bootstrap?

Demo

What is Lorem Ipsum?

Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.



HTML

<div class="row">
        <div class="span8">
            <h3>What is Lorem Ipsum?</h3>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit,<br>
            sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
        </div>
</div>

CSS

<style>
        .row { 
                text-align: center; 
        }
</style>

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