Fix chat x-overflow for narrow screen.

src/components/SolsticeApp.tsx

@@ -13,7 +13,7 @@ import { selectSocket, SocketState } from "modules/socket/slice";
 
 const MainPane: FC = () => {
   return (
-    <main className="flex-1 min-h-0">
+    <main className="flex-1 min-h-0 w-full">
       <Switch>
         <Route path={roomListPath}>
           <RoomsPane />

src/modules/room/RoomsPane.tsx

@@ -45,7 +45,7 @@ const RoomsPane: FC<{}> = () => {
       <div className="w-80 h-full">
         <RoomList rooms={rooms} />
       </div>
-      <div className="flex-grow">
+      <div className="flex-1 overflow-auto">
         <Switch>
           <Route exact path={path}>
             <RoomChatPane rooms={rooms} loginUserName={login.username!} />