// Set a couple of vars
$titleColor: #000
$titleSize: 24px

.article
  .title
    color: $titleColor
    font-size: $titleSize
  .alt-title
    @extend .title
    border-bottom: 1px solid lighten($titleColor, 80%)    // #ccc
    color: transparentize(lighten($titleColor, 20%), 0.1)
  .sub-title
    @extend .title
    font-size: round($titleSize * 0.85)    // 20.4px
    &:hover
      background-color: transparentize(change-color($titleColor, $red: 255), 0.8);