page of post thumbnails – want hover effect to reveal post title

Do you meant to say Alt tag of HTML? If so try this link:

https://www.w3schools.com/tags/att_img_alt.asp

If not explain further with a link to your site to understand the question.

It’s not alt, it’s title that creates a pop-up on mouse-over.

It’s not alt, it’s title that creates a pop-up on mouse-over.

Yes was thinking of something else. We have a final day of football in UK and so I am more concerned about it at the moment.

It is indeed the tile.

LOL! Gotta keep your priorities straight after all! Is “your” team winning?

Here’s the page:
https://urbaninteractive.us/client/kristadenio/by-krista-denio/

Looking to eliminate the default rollover popover box thing and have a div with a fancier style slide up in a specific position on the thumbnail.

Yep, those are the title=”XXX” attributes assigned to each image. To get rid of them, you’ll have to go through and remove that from each image. I think fancier pop-ups are usually done with Javascript — there are probably plug-ins to do something like that — search the plug-ins page.