Visited link style not working for a link block with image inside

Hello everyone, this is my first post asking for help!

The problem is this:
I have a grid with images inside link blocks and I need to set up a White Overlay color for the Visited Link Style for each one of them. I’ve already defined the style but it doesn’t seem to be working.

Could you help me find out what I’m doing wrong?

Thank you in advance!

Here is my public share link: [LINK][1]

Published site: