Feature titles not displayed on top of images in Firefox

[Bukama]

On Firefox the image headers are not displayed.
Works fine in Chrome and Edge (but later is based on Chromium so no big suprise)
(edit: also works on Safarti on mobile)

[nipafx]

2b5f995 didn't work because it made the links unclickable to varying degree (not at all in Firefox, only partially in Chrome). I'm afraid a proper fix needs to stop fiddling with negative margins and z-index.

[nipafx]

It's not important enough to block 1.0, so I'm removing it from the milestone.