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

[ghost]

Preflight Checklist

• [x] 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.

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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.

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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

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Expected behavior

The content should take up the entire viewport height.

Screenshots

Additional context

None

[ghost]

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