Responsive (from Twitter Bootstrap)

responsive.css

/* Large desktop */
@media (min-width: 1200px) { }
 
/* Portrait tablet to landscape and desktop */
@media (min-width: 768px) and (max-width: 979px) { }
 
/* Landscape phone to portrait tablet */
@media (max-width: 767px) { }
 
/* Landscape phones and down */
@media (max-width: 480px) { }