Sorry for the untimely response.
There’s no default Transparent buttons in the theme, but we could work it out for you if you would customizing a bit on your installation.
Please include a WordPress admin access and point us to which buttons you want transparent, and we’ll gladly find a way.
Regarding background, it’s not included by default, and would be actually very tricky to apply. Kindly guide us to which section you would like to achieve this for and we’ll see what we can do.