fix style of menu item

src/app/components/shared/questionwall/question-wall/question-wall.component.scss

@@ -314,10 +314,6 @@
   font-weight: bold;
 }
 
-.selection:focus {
-  background-color: black !important;
-}
-
 h2 {
   color: red;
   font-weight: normal !important;