how to make slider for product image gallery

I am trying to add a slider so the product gallery images are smaller and able to scroll through. Also I am trying to increase font size on Buy Now button. Any help would be appreciated, I have been searching for hours.

Here is the product page (site in not live) https://webdesign.artscube.biz/product/blueberry-vaccinium/

[Large code excerpt removed by moderator per forum rules. Please use the pastebin for all large code excerpts. It works better anyway.]

https://www.ads-software.com/plugins/woocommerce/