code: function updatePageStyle(pageName) {
          var pageCssId = 'gh-' + pageName.replace('.', '-');
          var elem = $rootElement.find('.maincontent');
  
          if (elem && elem.length) {
              elem = angular.element(elem[0]);
              elem.attr('id', pageCssId);
          }
      }
docs: Update the class name used to key off all styles on the page
  @param pageName