message: Style follow buttons
diff: .ChannelBlockGroup__header
  margin 2em .5em 1em
  + display flex
  + justify-content space-between
  +
  + .ChannelBlockGroup__follow
  + vertical-align middle
  + > span
  + border 1px solid colors-gray-border
  + border-radius .25em
  + padding 0.75em 1.25em
  + font-size font-size-xs
  + font-weight bold
  .ChannelBlockGroup__title > h4.Type
  font-weight bold
  - // .ChannelBlockGroup__inner
  - // opacity 0.3
  -
  .ChannelBlockGroup__inner:hover
  opacity 1
  