How to make the Facebook Like Box responsive?

NOTE: this answer is obsolete. See the community wiki answer below for an up-to-date solution.

I found this Gist today and it works perfectly: https://gist.github.com/2571173

(Many thanks to https://gist.github.com/smeranda)

/* 
Make the Facebook Like box responsive (fluid width)
https://developers.facebook.com/docs/reference/plugins/like-box/ 
*/

/* 
This element holds injected scripts inside iframes that in 
some cases may stretch layouts. So, we're just hiding it. 
*/

#fb-root {
    display: none;
}

/* To fill the container and nothing else */

.fb_iframe_widget, .fb_iframe_widget span, .fb_iframe_widget span iframe[style] {
    width: 100% !important;
}