metabuilder/packages/user_manager/seed/styles.json

[
  {
    "id": "user_manager_base",
    "type": "component",
    "category": "package",
    "className": "user_manager",
    "description": "Base styles for User Manager package",
    "priority": 100,
    "css": ".user_manager {\n  /* Add package-specific styles here */\n}"
  }
]