Add selecting next/previous tunit and highlight it

assets/css/article.css

@@ -15,6 +15,14 @@
   @apply hover:bg-gray-700;
 }
 
+.article .tunit[current="yes"] {
+  @apply bg-amber-300 text-stone-700 hover:bg-amber-200 hover:text-red-900;
+}
+
+.dark .article .tunit[current="yes"] {
+  @apply bg-amber-500/70 text-white hover:bg-amber-500/70 hover:text-red-900;
+}
+
 .article a.hide-link {
   display: none;
 }