**Problem:**
On screens narrower than 483px, the horizontal button layout caused overlap
between back-to-top button and other buttons due to limited width.
**Solution:**
Added media query for max-width: 483px to vertically stack back-to-top button:
- Moved back-to-top to LEFT side (left: 1.5rem)
- Positioned ABOVE info button (bottom: 5.5rem)
- Maintains 4rem vertical spacing between buttons (same as desktop)
**Layout behavior:**
- Above 900px: All buttons vertical on left side (desktop)
- 483px - 900px: Buttons horizontal at bottom center + back-to-top at bottom-right
- Below 483px: Buttons horizontal at bottom center + back-to-top stacked above info button (left side)
This prevents button overlap on narrow mobile devices while maintaining
consistent spacing and positioning.
Files modified: static/css/main.css
juanatsap
8da442b248