message: Increase width for channel block group
diff: margin 2em auto
  height 0
  - for i in (1..5)
  + for i in (1..8)
  @media (min-width:(block_width_mar * i) + 20) and (max-width:(block_width_mar * (i + 1)) + 20)
  &__inner
  width (block_width_mar * i)
  