moved transparent button styles into button itself

src/App.scss

@@ -88,6 +88,10 @@ a {
   font-family: sans-serif;
   font-family: var(--interfaceFont, sans-serif);
 
+  &.-sublime {
+    background: transparent;
+  }
+
   i[class*=icon-],
   .svg-inline--fa {
     color: $fallback--text;

src/components/mention_link/mention_link.scss

@@ -38,11 +38,6 @@
     }
   }
 
-  .new:not(.-highlighted) {
-    .short {
-      background: none;
-    }
-  }
   .new {
     &,
     &.-highlighted {

src/components/mention_link/mention_link.vue

@@ -15,8 +15,8 @@
       :class="[{ '-you': isYou, '-highlighted': highlight }, highlightType]"
     >
       <button
-        class="short"
-        :class="highlight ? 'button-default' : 'button-default' "
+        class="short button-default"
+        :class="{ '-sublime': !highlight }"
         @click.prevent="onClick"
       >
         <!-- eslint-disable vue/no-v-html -->