fix highlighted line background on option toggle (#11548)

fixes #11355

Author: a-hariti

src/components/docPage/type.scss

@@ -203,7 +203,7 @@
     background-color: rgba(255, 255, 255, 0.15);
   }
   100% {
-    background-color: rgba(255, 255, 255, 0);
+    background-color: none;
   }
 }