message: On group hover update border-color
diff: .ChannelBlockGroup
  width 100%
  border-top 1px solid bordergray
  - padding (unit * 2) 0
  + padding 2em 0
  &__inner
  margin 0 auto
  display flex
  justify-content flex-start
  + &:hover
  + border-color colors-gray-light
  for i in (1..5)
  @media (min-width:(block_width_mar * i) + 20) and (max-width:(block_width_mar * (i + 1)) + 20)
  