I work on a project meant to sell a service and meant to manage the service being sold to the consumer. However, the button to actually buy the service is hidden by a scroll bar on all but the widest of screens. Unless you scroll the widget or have a 22 inch monitor, you will not see the purchase button. Why? The UI was designed in on a wide screen and we developers are just the implementers of the picture. UI is qui…
The way I've solved this these days when working with people who aren't familiar with responsive design (older/inexperienced designers or clients directly) is to print them an A3 page with outlines of a vertical phone and tablet and a horizontal desktop screen, vaguely to scale, and all including a "below the fold area", and tell them to draw on that. This almost always gives me enough information to implement a properly responsive design.