// position pos
$position : (
  ( vals: (
    'a' : absolute,
    'r' : relative,
    'f' : fixed,
    'st' : sticky,
  ),),
  ( vals: (
    'a' : absolute,
    'r' : relative,
    'f' : fixed,
  ), bp: $bp-800w-mx,),
  ( vals: (
    'a' : absolute,
    'r' : relative,
    'f' : fixed,
  ), bp: $bp-600w-mx,),
);