text: var show_duration = 200;
  
  $(document).ready( function () {
  
      $("#settings-btn-menu").click( function () {
  
          $("#main-app").toggle(show_duration)
          $("#settings-menu").toggle(show_duration)
  
      });
  
      $("#settings-back-btn").click( function () {
          $("#main-app").toggle(show_duration)
          $("#settings-menu").toggle(show_duration)
      });
  
      $("li").click( function () {
          $("li").removeClass('active');
          $(this).addClass("active");
      });
  
      $("#appearance-li").click( function () {
          $("#appearance-content").show();
          $("#general-content").hide();
          $("#about-content").hide();
      });
      $("#general-li").click( function () {
          $("#appearance-content").hide();
          $("#general-content").show();
          $("#about-content").hide();
      });
      $("#about-li").click( function () {
          $("#general-content").hide();
          $("#about-content").show();
          $("#appearance-content").hide();
      })
  
  })