code: function addStyles(page, styles) {
          page.evaluate(function(styles) {
              var style = document.createElement('style'),
                  content = document.createTextNode(styles),
                  head = document.head;
  
              style.setAttribute('type', 'text/css');
              style.appendChild(content);
  
              head.insertBefore(style, head.firstChild);
          }, styles);
      }
docs: /* Screenshot rendering