<apex:page showHeader="false" sidebar="false" renderAs="PDF">

        <apex:stylesheet value="{!URLFOR($Resource.bootstrap, 'bootstrap-3.3.5/css/bootstrap.css')}" />
        <apex:stylesheet value="{!URLFOR($Resource.bootstrap, 'bootstrap-3.3.5/css/bootstrap-theme.css')}" />

        <div class="container">
            <div class="row">
                <div class="col-md-6">
                    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
                </div>
                <div class="col-md-6">
                    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
                </div>
            </div>
        </div>
</apex:page>