Login page: content does not extend to the screen end on mobile screen size

[ghost]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Describe the bug

On the login/sign up screens, the site content does not extend till the end of screen vertically. White space can be seen between the content end and the screen end.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://www.mumble.dev/signup or https://www.mumble.dev/login
2. Shrink screen size to mobile view
3. Scroll down to the bottom
4. See the white space beneath the content

Expected behavior

The content should extend till the end of screen vertically on mobile screen sizes.

Add additional instructions and considerations for the assignee

None

Screenshots

Additional context

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[ghost]

I would like to take up this issue if possible.