lower_than(max)
  media = 'screen and (max-width: %s)' % max

  @media media
    {block}

greater_than(min)
  media = 'screen and (min-width: %s)' % min

  @media media
    {block}

between(min, max)
  media = 'screen and (min-width: %s) and (max-width: %s)' % (min max)

  @media media
    {block}

for_small_phone()
  +lower_than(breakpoint_small_phone -1px)
    {block}

for_large_phone()
  +between(breakpoint_small_phone, breakpoint_large_phone - 1px)
    {block}

for_tablet()
  +between(breakpoint_large_phone, breakpoint_tablet - 1px)
    {block}

for_small_desktop()
  +between(breakpoint_tablet, breakpoint_small_desktop - 1px)
    {block}

for_large_desktop()
  +greater_than(breakpoint_small_desktop)
    {block}