Wizard: move close button to the top in mobile view

[johnwatkins0]

Summary

This fixes #5193 by moving the wizard's "Close" button to the top right of the screen at mobile widths. This opens up space for the other buttons, particularly on the final screen in reader mode, where the "Customize" button was being pushed to the right.

Before	After

Checklist

• My pull request is addressing an open issue (please create one otherwise).
• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

[github-actions]

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[westonruter]

@johnwatkins0 Should the margins be equalized? Right now the right margin is 16px whereas the top margin is 8px on the button:

That would make the “Close” text more equidistant from the top and right.

[westonruter]

In other words, add margin: 8px or margin-right: 8px for the Close button.

[johnwatkins0]

In other words, add margin: 8px or margin-right: 8px for the Close button.

@westonruter Adjusted the padding in 076d826, but since you mentioned margin I might be misinterpreting. Let me know if it looks better to you now.

[westonruter]

Yes, I should have said padding instead of margin.