I've received some code reviews and I'd like to share the below since it seems very useful to have clear codes.

Order of CSS properties

1. Layout Properties (position, float, clear, display)
2. Box Model Properties (width, height, margin, padding)
3. Visual Properties (colour, background, border, box-shadow)
4. Typography Properties (font-size, font-family, text-align, text-transform)
5. Miscellaneous Properties (cursor, overflow, z-index)