message: Minor style changes for blog posts
diff: blockquote
  collapsed-margins(2em)
  + line-height line-height-tall
  p
  collapsed-margins(2em)
  font-size font-size-base
  line-height line-height-tall
  + small
  + font-size font-size-xs
  +
  + sup
  + vertical-align super
  + font-size font-size-xs
  +
  img
  iframe
  display block
  