What is Responsive Design?
It is an approach aimed at crafting sites to provide an optimal viewing and interaction experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones).
In other words, it is a flexible and fluid grid system that adapts your website to mobile devices and the desktop or any other viewing environment.
QGroundControl website was idealized based on this thought. So, here at this section, you will find guidelines and references to craft this approach.