message: Standardize lightbox font size
diff: +sb_font_size = 13px
  +sb_line_height = 1.5
  +
  .block-sidebar
  +
  width unit * 18
  min-width unit * 18
  height 100vh
  margin-top 0
  &__separator
  - font-size 0.8rem
  + font-size sb_font_size
  color lightgray
  border-bottom 1px solid bordergray
  padding-bottom (unit / 2)
  margin-bottom (unit / 2)
  -
  &__wrapper
  flex 1
  -
  &__toggle-info
  padding (unit + 3) 3px
  display block
  color lightgray
  font-weight bold
  - font-size 0.8rem
  + font-size sb_font_size
  cursor pointer
  text-align right
  display block
  display none
  &__date
  - font-size 0.8rem
  - line-height 1.3rem
  + font-size sb_font_size
  + line-height sb_line_height
  color lightgray
  > a
  font-weight bold
  &__source
  font-weight bold
  - font-size 0.8rem
  - line-height 1.6rem
  + font-size sb_font_size
  + line-height sb_line_height
  &__original
  ellipsis(100%)
  vertical-align bottom
  