SimpleGrid Responsive. Infinite nesting. One class per element. Simple. Responsive SG is prepared for 4 distinct ranges of screen size: screens < 720px, screens > 720px, screens > than 985px, and screens > than 1235px. So people visiting your site will receive a layout that's tuned to the size of their browser window. Say goodbye to horizontal scrollbars. Self-Aware Most grid systems use one class