(function($){
    // variables
    elementWidth = $('ul').width(),
    containerWidth = $('nav').width(),
    difference = elementWidth-containerWidth,
    finalWidth = difference * 1.5,
    element = $('ul');
    
    // active on click
    $('li').on('click', function(){
      $('li').removeClass('active');
      $(this).addClass('active');
    });
    
  })(jQuery);