refactor: Remove the extra code

source/css/_components/copy.styl

@@ -4,24 +4,15 @@
   right: 0
   width: 1.5rem
   height: 1.5rem
-  // Eliminate the problem of blank nodes occupying size
-  // due to the "inline-block" attribute.
-  font-size: 0
   text-align: center
   color: $black-light
   cursor: pointer
 
-  .fa
-    font-size: 14px
-    transform: translateY(50%)
-
 .highlight
   figcaption.custom
     padding: .1rem 0
     min-height: 1.5rem
-    font-size: 0
 
     span
       margin: 0 1rem 0 .6rem
-      font-size: $font-size-large
       color: alpha($highlight-header-color, .5)