Design in the internet changed fundamentally in the last few years. When people talk about responsive web design, most of them have mobile optimized web pages in mind. But that's just half of the new flexibility that we get from responsive designs. In the time before responsive design, designers tried to find the resolution that fits for most of the visitors, very often 1024px and people with wider screens got empty space left and right of the page. With responsive designs you can now also optimize for this wide screens.