Rolling up our responsive sleeves
Watch Rolling up Our Responsive Sleeves — a video of Ethan Marcotte’s June 2012 AEA presentation.
fluid grids
WordPress Meet Responsive Design
Books
Learn how three WP pros use media queries and fluid images and grids to create responsive WordPress sites.
Fluid Grids by Ethan Marcotte
Resources
Fluid grids are the foundation of responsive web design.
Responsive Web Design by Ethan Marcotte
Resources
Everything you need to know to design beautifully responsive websites.
Code Poet 