Update and improve aesthetics on UI/UX

[pieterprovoost]

• [ ] Logo not centered and insufficient spacing
• [ ] Lack of contrast in search button
• [ ] Incorrect sizing of search button
• [ ] Large white space above footer
• [ ] Insufficient spacing in footer

[jmckenna]

cc @arnounesco

[pbuttigieg]

• [ ] In spatial view, the background jumps around when different polygons in the map are hovered over.