text: let beOpenNavbar = false;
  let canOpen = true;
  
  $('#btn-hamburger').click(function () {
      if (canOpen == true) {
          switch (beOpenNavbar) {
              case true:
                  canOpen = false;
                  beOpenNavbar = false;
                  if (beOpenNavbar == true) {
                      $('header').attr('style', 'width: 200px;');
                      setTimeout(function () {
                          $('.navbar-content').attr('style', 'display: block;');
                      }, 500)
                  }
                  if (beOpenNavbar == false) {
                      $('header').attr('style', '');
                      $('.navbar-content').attr('style', '');
                  }
                  setTimeout(function () {
                      canOpen = true;
                  }, 500)
                  break;
              case false:
                  canOpen = false;
                  beOpenNavbar = true;
                  if (beOpenNavbar == true) {
                      $('header').attr('style', 'width: 200px;');
                      setTimeout(function () {
                          $('.navbar-content').attr('style', 'display: block;');
                      }, 500)
                  }
                  if (beOpenNavbar == false) {
                      $('header').attr('style', '');
                      $('.navbar-content').attr('style', '');
                  }
                  setTimeout(function () {
                      canOpen = true;
                  }, 500)
                  break;
          }
      }
  });