Fix the layout on tablets and mobile devices

[RodBrowning]

Hey there,

I just wanted to bring to your attention that I noticed the search bar was shrinking on smaller screens. Upon further investigation, I found that the app div should have been placed two levels higher in the DOM to prevent this from happening. Additionally, I took the opportunity to improve the spacing even further.

Please let me know if you have any questions or concerns about these changes.

Thanks!