Modals not acting as expected on Firefox.

[Fr3akyMurk]

Currently, if you use the Firefox browser and open any modal, it will be off center and at the very top of the page, thus producing a unwanted behavior.

Google Chrome.

Firefox

There are no differences in the code, since the change.
This is also present at the homepage.

With some investigation, this seems like it originates from the root modal itself and not the signin modals, so in other words.... this will occur on every modal.

[Aesop7]

I ran into this as well. Threw together a small PR to hopefully address this in the repo -- you can check it out for the fix that I'm using: #80

[Fr3akyMurk]

I ran into this as well. Threw together a small PR to hopefully address this in the repo -- you can check it out for the fix that I'm using: #80

Thank you for finding a fix to this issue, now to wait for Steven to see your pull request.