The following rules must be followed:

- The CSS must be valid conform CSS 2.1 specification. This can be tested using the W3C validator

The following recommendations could be followed:

• Proprieties:
  • alphabetical order;
  • 2 spaces indentation;
  • use of CSS shorthands;

• Grouping:
  • comment headers for separation and grouping of different parts of the code;

• Localization:
  • "Overwrites" and "Should be in"  comments for dependencies overwriting;