CMS item visited state not working

Hi there!
I was wondering if there is a way to indicate visited CMS item? I have these cards on the bottom of the CMS item template. I tried changing the bgn color of visited Link block as a test but it doesn’t work for some reason. Any other ideas? Basically I’d like to show which items were read so the visitor don’t miss any content or click on the same card twice. Thanks so much in advance!