Figure captions

The captions doesn't differ from normal text on the website (and in the PDF). This is a little confusing. I suggest to center the caption (.figure .caption { text-align: center; }) or indent it with some pixels (.figure .caption { text-indent: 20px; }).

Prevent images to breakout of the content

The content on the symfony2 website is690px width. We should add something like this in the stylesheet to prevent images to be wider than the content:

.box_article img{    max-width:100%;}

This issue is created after the discussion in#1982, you can read more information in that issue.