http://stylelint.io/ config file for https://atom.io/packages/atom-beautifier

.stylelintrc

{
  "rules": {
    "at-rule-empty-line-before": "never",
    "at-rule-no-vendor-prefix": true,
    "block-closing-brace-newline-after": "always",
    "block-closing-brace-newline-before": "always",
    "block-closing-brace-space-after": "always-single-line",
    "block-closing-brace-space-before": "always-single-line",
    "block-no-empty": true,
    "block-opening-brace-newline-after": "always",
    "block-opening-brace-newline-before": "always-single-line",
    "block-opening-brace-space-after": "always-single-line",
    "block-opening-brace-space-before": "always",
    "color-hex-case": "upper",
    "color-hex-length": "long",
    "color-no-invalid-hex": true,
    "comment-empty-line-before": "always",
    "comment-whitespace-inside": "always",
    "custom-media-pattern": string,
    "custom-property-no-outside-root": true,
    "custom-property-pattern": string,
    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",
    "declaration-block-semicolon-newline-after": "always",
    "declaration-block-semicolon-newline-before": "never-multi-line",
    "declaration-block-semicolon-space-after": "always-single-line",
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-single-line-max-declarations": 1,
    "declaration-colon-newline-after": "always-multi-line",
    "declaration-colon-space-after": "always",
    "declaration-colon-space-before": "never",
    "function-blacklist": string,
    "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",
    "function-comma-space-before": "never",
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-parentheses-newline-inside": "always-multi-line",
    "function-url-quotes": "double",
    "function-whitelist": ["rgb","rgba","calc","-moz-calc","-webkit-calc"],
    "function-whitespace-after": "always",
    "indentation": 4,
    "max-empty-lines": 1,
    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-no-vendor-prefix": true,
    "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-newline-before": "always",
    "media-query-list-comma-space-after": "always",
    "media-query-list-comma-space-before": "always",
    "no-eol-whitespace": true,
    "number-leading-zero": "always",
    "number-max-precision": 4,
    "number-no-trailing-zeros": true,
    "number-zero-length-no-unit": true,
    "property-blacklist": [],
    "property-unit-blacklist": [],
    "property-unit-whitelist": [],
    "root-no-standard-properties": true,
    "rule-nested-empty-line-before": "never",
    "rule-non-nested-empty-line-before": [ "never", { ignore: ["after-comment"] }],
    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "never",
    "selector-list-comma-newline-after": "always-multi-line",
    "selector-list-comma-newline-before": "always-multi-line",
    "selector-list-comma-space-after": "always",
    "selector-list-comma-space-before": "never",
    "selector-pseudo-element-colon-notation": "double",
    "selector-root-no-composition": true,
    "string-quotes": "double",
    "unit-blacklist": string,
    "unit-whitelist": ["px", "em", "rem", "deg", "%", "s"],
    "value-list-comma-newline-after": "never-multi-line",
    "value-list-comma-newline-before": "always-multi-line",
    "value-list-comma-space-after": "always",
    "value-list-comma-space-before": "never",
    "value-no-vendor-prefix": true
  }
}