text: 
  import React from 'react';
  
  import Toolbar from './components/Toolbar/Toolbar';
  import SideDrawer from './components/SideDrawer/SideDrawer';
  import Backdrop from './components/Backdrop/Backdrop';
  
  
  function App() {
   /* state = {
      sideDrawerOpen: false 
    };
    drawerToggleClickHandler = () => {
       this.setState((prevState)=>{
         return{sideDrawerOpen: !prevState.sideDrawerOpen};
       });
    };
    
    let sideDrawer;
    let backdrop;
    if (this.state.sideDrawerOpen){
      sideDrawer = <SideDrawer />;
      backdrop = <Backdrop />
    }*/
    return (
      <div style={{height:'100%'}}>
        <Toolbar />
        <Backdrop />
         <SideDrawer />
        <main style={{marginTop:'64px'}}>
        <p>This is The page !!! </p>
        </main>
        
      </div>
    );
  }
  
  export default App;