After pseudo-element prevents clicking on image links

[jessecowens]

Describe the bug
When using a gallery, linking to Attachment Pages, Media, or Custom Links does not work, because the element .gallery-icon::after intercepts the click.
Adding .gallery-icon::after{z-index: -100;} resolves the issue.

To Reproduce
Steps to reproduce the behavior:

1. Install WordPress with BoldGrid Inspirations and install a version 1 theme.
2. Add a gallery to a page and choose link to: Attachment Page
3. Preview the page and attempt to click on the image in the gallery. The cursor remains default, not pointer, and the link is not clickable.

Additional context
This issue was reported in the BoldGrid User Forums here