CodePen

HTML

            
              <h1>Welcome to the Jungle</h1>
            
          
!

CSS

            
              h1 {
  font:bold italic 4.2em 'Impact';
  color:#E62936;
  transition:color 4.5s ease-in;
}

.georgia {
  font:lighter normal 4em 'Georgia';
  color:#293FE6;
  transition:color 4.5s ease-in;
}
            
          
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JS

            
              setInterval(function() {
      $('h1').toggleClass('georgia');
}, 5000);
            
          
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