/** * 1. Prevent system color scheme's background color being used in Firefox, IE, * and Opera. * 2. Prevent system color scheme's text color being used in Firefox, IE, and * Opera. * 3. Set default font family to sans-‐serif. * 4. Prevent iOS text size adjust after orientation change, without disabling * user zoom. */ html { background: #fff; /* 1 */ color: #000; /* 2 */ font-‐family: sans-‐serif; /* 3 */ -‐ms-‐text-‐size-‐adjust: 100%; /* 4 */ -‐webkit-‐text-‐size-‐adjust: 100%; /* 4 */ } /** * Remove default margin. */ body { margin: 0; } { explains CODE