Nowadays, it's not only important to develop your clients' websites to look good on all browsers, and on PC and MAC, it's also a must that websites are viewable on tablets and mobile devices. A lot of people opt for making one version of their site for desktop and another for mobile. Others choose Responsive Design, a mix of fluid grids and layouts, flexible images and an intelligent use of CSS media queries. There are quite a few sites dedicated to lending a hand with responsive grids, Gridpak, CSSGrid, Skeleton and SimpleGrid, just to name a few. Here are 50 (plus 1) examples of responsive websites.