Hi, I have put unicode quotation marks as a text on top of the image and added as advanced layer css
The quotation marks are transparent now in the add-on but not on the web page: http://humanisticevolution.com/en/home/
Get in touch with Slider Revolution Author @ThemePunch-Support-K or @themepunch hope they will help you to solved your issue.
Thanks for using Slider Revolution. Not really sure what you mean by “The quotation marks are transparent now in the add-on”. Kindly contact us via our email at firstname.lastname@example.org and we’ll check your slider setup and provide assistance where we can.