Login page: content does not extend to the screen end 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, without success.

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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.

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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

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Expected behavior

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

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Add additional instructions and considerations for the assignee

None

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Screenshots

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Additional context

None

[ghost]

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