.stylelintrc.json

{
  "extends": ["stylelint-config-standard"],
  "rules": {
    "declaration-property-value-allowed-list": {
      "/color/": ["/^var\\(--/", "transparent"]
    },
    "unit-disallowed-list": ["px"],
    "selector-class-pattern": "^[a-zA-Z\\-]+$"
  }
}