remove old styles and begin phase out old elements

src/App.js

@@ -1,17 +1,12 @@
 import React from 'react';
 import Menu from './features/menu';
 import TimbreSwitcher from './features/timbre/timbreSwitcher';
-import './App.css';
 
 function App() {
   return (
-    <div className='App'>
-      <header className='App-header'>
-        <div className='App-spacer'>
-          <Menu />
-        </div>
-        <TimbreSwitcher />
-      </header>
+    <div className='grid grid-cols-6 grid-rows-1 gap-4 h-screen'>
+      <Menu className='col-span-1' />
+      <TimbreSwitcher className='col-span-5' />
     </div>
   );
 }