Activity rss subscribe button neither clickable nor hoverable in personal dashboard

Summary

Although there is a RSS subscribe to activities button, this button neither on Gitlab.com nor on my local 11.0.3 ce installation is clickable. Also checked with the gitlab-development-kit, not clickable as well.

Steps to reproduce

  1. log into your account
  2. go to Activity from the top navigation bar (for example https://gitlab.com/dashboard/activity)
  3. try to click on the RSS subscribe button

Example Project

Don't need a repository, because it is in the core functionality.

What is the current bug behavior?

RSS subscribe button in activities dashboard not clickable, even though the link inside <a href src=""is working.

What is the expected correct behavior?

Rss subscribe button in activities dashboard clickable.

Relevant logs and/or screenshots

rss

Output of checks

This bug happens on GitLab.com
Also it happens on 11.0.3 ce aa620755

Possible fixes

Probably the surrounding <div> has a class, which gets ignored by the pup-up code/logic.
I will take a deeper look into this.