Info / styling improvements

- Added request URI info into debug details
- Switched fixed positioning to absolute (not sure why this was fixed, makes the details move with scrolling?)
- Force high z-index on hover, useful for overlapping ESI's
- Darker red on hover for clarity
- Removed !important's, these should be overwritable if necessary, inline styles will take priority anyway
- Switched out inlines styles for hover styles / clarity
- Switched to sprintf for readability