$BreakpointSettings: (
  'xx-small': 320px,
  'x-small': 360px,
  'small': 640px,
  'medium': 768px,
  'large': 1024px,
  'x-large': 1200px,
  'xx-large': 1280px
);

$GlobalSettings: map-merge($GlobalSettings, $BreakpointSettings);