basic stylelint file

.stylelintrc

{
    "rules": {
      "color-no-invalid-hex": true,
      "font-family-name-quotes": "always-where-recommended",
      "font-family-no-duplicate-names": true,
      "function-calc-no-unspaced-operator": true,
      "function-comma-newline-after": "never-multi-line",
      "function-comma-newline-before": "never-multi-line",
      "function-comma-space-after": "always-single-line",
      "function-comma-space-before": "never",
      "function-linear-gradient-no-nonstandard-direction": true,
      "function-max-empty-lines": 0,
      "function-parentheses-newline-inside": "never-multi-line",
      "function-parentheses-space-inside": "never-single-line",
      "function-url-quotes": "always",
      "function-whitespace-after": "always",
      "number-leading-zero": "never",
      "number-max-precision": 2,
      "number-no-trailing-zeros": true,
      "string-no-newline": true,
      "unit-case": "lower",
      "unit-no-unknown": true,
      "value-keyword-case": "lower",
      "value-no-vendor-prefix": true,
      "value-list-comma-newline-after": "never-multi-line",
      "value-list-comma-newline-before": "never-multi-line",
      "value-list-comma-space-after": "always",
      "value-list-comma-space-before": "never-single-line",
      "value-list-max-empty-lines": 0,
      "custom-property-empty-line-before": "never",
      "shorthand-property-no-redundant-values": true,
      "property-case": "lower",
      "property-no-unknown": true,
      "property-no-vendor-prefix": true,
      "keyframe-declaration-no-important": true,
      "declaration-bang-space-after": "never",
      "declaration-bang-space-before": "always",
      "declaration-colon-newline-after": "always-multi-line",
      "declaration-colon-space-after": "always",
      "declaration-colon-space-before": "never",
      "declaration-empty-line-before": "never",
      "declaration-block-no-duplicate-properties": true,
      "declaration-block-no-redundant-longhand-properties": true,
      "declaration-block-no-shorthand-property-overrides": true,
      "declaration-block-semicolon-newline-after": "always",
      "declaration-block-semicolon-space-before": "never",
      "declaration-block-single-line-max-declarations": 1,
      "declaration-block-trailing-semicolon": "always",
      "block-closing-brace-empty-line-before": "never",
      "block-closing-brace-newline-after": "always",
      "block-closing-brace-newline-before": "always",
      "block-no-empty": true,
      "block-opening-brace-newline-after": "always",
      "block-opening-brace-space-before": "always",
      "selector-attribute-brackets-space-inside": "never",
      "selector-attribute-operator-space-after": "never",
      "selector-attribute-operator-space-before": "never",
      "selector-attribute-quotes": "always",
      "selector-combinator-space-after": "always",
      "selector-combinator-space-before": "always",
      "selector-max-id": 0,
      "selector-no-vendor-prefix": true,
      "selector-pseudo-class-case": "lower",
      "selector-pseudo-class-no-unknown": true,
      "selector-pseudo-element-case": "lower",
      "selector-pseudo-element-no-unknown": true,
      "selector-type-case": "lower",
      "selector-type-no-unknown": true,
      "selector-max-empty-lines": 0,
      "selector-list-comma-newline-after": "always",
      "media-feature-colon-space-after": "always",
      "media-feature-colon-space-before": "never",
      "media-feature-name-case": "lower",
      "media-feature-name-no-unknown": true,
      "media-feature-name-no-vendor-prefix": true,
      "media-feature-parentheses-space-inside": "never",
      "media-feature-range-operator-space-after": "always",
      "media-feature-range-operator-space-before": "always",
      "at-rule-name-case": "lower",
      "at-rule-name-space-after": "always-single-line",
      "at-rule-no-vendor-prefix": true,
      "comment-no-empty": true,
      "max-empty-lines": 2,
      "max-nesting-depth": 3,
      "no-descending-specificity": null,
      "no-extra-semicolons": true,
      "no-invalid-double-slash-comments": true,
      "no-unknown-animations": true
    }
  }