The class pure-u-2-4
is not recognized by Pure. Instead, use the class pure-u-1-2
to get columns with 50% width:
<div class="pure-g-r">
<div class="pure-u-1-2">
<p>Left side.</p>
</div>
<div class="pure-u-1-2">
<p>Right side.</p>
</div>
</div>