In simple terms, a responsive custom web design uses “media queries” to figure out what resolution of device it’s being served on. Flexible images and fluid grids then size correctly to fit the screen. If you’re viewing this article on a desktop browser, for example, try making your browser window smaller. The images and content column will shrink, then the sidebar will disappear altogether. On our homepage, you’ll see the layout shrink from three columns, to two columns, to a singular column of content.