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Remember the “mobile first” mantra? The idea was born out of the early days of responsive web design. Rather than design and build for the “desktop” up front, a “mobile-first” approach treats small screens as first-class citizens. There’s a reduced amount of real estate, certainly less than the number of pixels we get from the viewport of Firefox expanded fullscreen on a 27-inch studio monitor.
The constraint is a challenge to make sure that whatever is sent to mobile devices is directly relevant to what users should need; nothing more, nothing less. Anything more additive to the UI can be reserved for wider screens where we’re allowed to stretch out and make more liberal use of space.
/* A sample CSS snippet for a responsive main content */