Consider first whether you really need this thing.
I would argue (and some might disagree) that having share buttons is no longer 'in line with the time.' It was 5-10 years ago.
In most likelihood you will struggle to add these to your site, will add a layer of complexity, and less than 1% of 1% of your users will ever actually share something to social media using the buttons. Plus if they actually want to share, they don't need a button on your site to do so.
In the past I spent a lot of time struggling to add stuff like this to my site and it had no impact. I would have been much better served spending that time crafting my message and my offer.
That said, anything like this that is functional in another template can be applied to responsive_classic. You just need to know how to pluck the code out of the other template.
In this instance, they probably used code similar to this plugin already available:
https://www.zen-cart.com/downloads.php?do=file&id=1325
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