How can I make the width of my <figcaption> match the width of the <img> inside its <figure> tag?

gistfile1.css

/*
* http://stackoverflow.com/questions/6534473/how-can-i-make-the-width-of-my-figcaption-match-the-width-of-the-img-inside
*/
figure { display: table; }
figcaption { display: table-caption; caption-side: bottom ; }