Login/Signup page: Body does not take up the entire html content height on mobile screen size

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file and found a similar one but the account in question has been deleted so I am guessing the user who reported the issue won't pursue it any longer.

Describe the bug

When shrinking screen to mobile device size, white space appears underneath the body indicating that the body is not taking up the entire html content height.

To Reproduce

Steps to reproduce the behavior:

1. Go to Login page or Sign up
2. Reduce browser window to mobile size
3. Scroll down to the bottom
4. See extra white space underneath the html content

Expected behavior

The content should take up the entire viewport height.

Screenshots

Additional context

None

I would like to take up this issue.