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var addCss = function(cssText) {
  var headTag = document.head || document.getElementsByTagName('head')[0];
  var styleTag = document.createElement('style');
  
  styleTag.type = 'text/css';
  if (styleTag.styleSheet) {
    styleTag.styleSheet.cssText = cssText;
  } else {
    styleTag.appendChild(document.createTextNode(cssText));
  }
  
  head.appendChild(styleTag);
}