components/Navbar.module.css

@@ -237,6 +237,7 @@
     height: stretch;
     top: 0;
     right: 0;
+    overflow: auto;
 
     padding: calc(calc(64rem / 16) - 1rem) calc(calc(64rem / 16) - 1rem)
       calc(calc(64rem / 16) - 1rem) calc(calc(78rem / 16) - 1rem);

components/Navbar.tsx

@@ -163,7 +163,7 @@ function reducer(state: MobileState, action: MobileAction): MobileState {
         isNavOpen: true,
         activeSubmenus: new Set([getMainRoute(action.route)]),
       };
-    case "toggle":
+    case "toggle": {
       const newSet = new Set(state.activeSubmenus);
       if (state.activeSubmenus.has(getMainRoute(action.route))) {
         newSet.delete(getMainRoute(action.route));
@@ -174,6 +174,7 @@ function reducer(state: MobileState, action: MobileAction): MobileState {
         isNavOpen: state.isNavOpen,
         activeSubmenus: newSet,
       };
+    }
     case "close":
       return initialState;
   }