<p>This <a href="https://www
.sitepoint.com/web-layout-101
-vertical-rhythm-is-a-drummer
/" target="_blank" title="Web
Layout 101: Vertical Rhythm is
a Drummer">article</a> also
explains how to add the grid
using a Chrome browser
extension. However I prefer to
use the grid as it is in my
css during development.</p>