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  function screen_size() {
    if (window.matchMedia('(max-width: 991px)').matches) {
      $('body').removeClass('view-desktop');
      $('body').addClass('view-mobile');
    } else {
      $('body').removeClass('view-mobile');
      $('body').addClass('view-desktop');
    }
  }

  screen_size();

  $(window).resize(function(){
    screen_size();
  });