Trouble integrating CSS Globe Tooltip in WordPress Image Gallery

I can’t get it to work. I simply calling the post_thumbnail function to display the image, and attempting to integrate the tooltip. Not working. Here’s the script: https://cssglobe.com/post/1695/easiest-tooltip-and-image-preview-using-jquery – it is showing working on this popular css gallery: https://bestwebgallery.com/

<a href="<?php the_post_thumbnail('large'); ?>" class="preview"><?php the_post_thumbnail(); ?></a>

Any suggestions why this wouldn’t work?

thanks