.stylelintrc

{
    "rules": {
        # Stylistic rules for CSS.
        "function-comma-space-after": "always",
        "function-comma-space-before": "never",
        "function-max-empty-lines": 0,
        "function-whitespace-after": "always",

        "value-keyword-case": "lower",
        "value-list-comma-newline-after": "always-multi-line",
        "value-list-comma-space-after": "always-single-line",
        "value-list-comma-space-before": "never",
        "value-list-max-empty-lines": 0,

        "unit-case": "lower",
        "property-case": "lower",
        "color-hex-case": "lower",

        "declaration-bang-space-before": "always",
        "declaration-colon-newline-after": "always-multi-line",
        "declaration-colon-space-after": "always-single-line",
        "declaration-colon-space-before": "never",
        "declaration-block-semicolon-newline-after": "always",
        "declaration-block-semicolon-space-before": "never",
        "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-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-combinator-space-after": "always",
        "selector-combinator-space-before": "always",
        "selector-descendant-combinator-no-non-space": true,
        "selector-pseudo-class-parentheses-space-inside": "never",
        "selector-pseudo-element-case": "lower",
        "selector-pseudo-element-colon-notation": "double",
        "selector-type-case": "lower",
        "selector-list-comma-newline-after": "always",
        "selector-list-comma-space-before": "never",

        "media-feature-colon-space-after": "always",
        "media-feature-colon-space-before": "never",
        "media-feature-name-case": "lower",
        "media-feature-parentheses-space-inside": "never",
        "media-feature-range-operator-space-after": "always",
        "media-feature-range-operator-space-before": "always",
        "media-query-list-comma-newline-after": "always",
        "media-query-list-comma-space-before": "never",

        "at-rule-name-case": "lower",
        "at-rule-name-space-after": "always",
        "at-rule-semicolon-newline-after": "always",
        "at-rule-semicolon-space-before": "never",

        "comment-whitespace-inside": "always",
        "indentation": 4,
    }
}