stylelint-config.json

{
  "rules": {
    "color-hex-case": "lower",
    "color-no-invalid-hex": true,

    "function-calc-no-unspaced-operator": true,
    "function-comma-space-after": "always-single-line",
    "function-comma-space-before": "never",
    "function-name-case": "lower",
    "function-url-quotes": "always",
    "function-whitespace-after": "always",

    "number-leading-zero": "always",
    "number-no-trailing-zeros": true,
    "number-zero-length-no-unit": true,

    "string-no-newline": true,
    "string-quotes": "single",

    "unit-case": "lower",
    "unit-no-unknown": true,
    "unit-whitelist": ["px", "%", "deg", "ms", "em"],

    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",

    "shorthand-property-no-redundant-values": true,

    "property-case": "lower",

    "declaration-block-no-duplicate-properties": true,
    "declaration-block-no-ignored-properties": true,
    "declaration-block-trailing-semicolon": "always",
    "declaration-block-single-line-max-declarations": 1,
    "declaration-block-semicolon-space-before": "never",
    "declaration-block-semicolon-space-after": "always-single-line",
    "declaration-block-semicolon-newline-before": "never-multi-line",
    "declaration-block-semicolon-newline-after": "always-multi-line",

    "block-closing-brace-newline-after": "always",
    "block-closing-brace-newline-before": "always-multi-line",
    "block-no-empty": true,
    "block-opening-brace-newline-after": "always-multi-line",
    "block-opening-brace-space-before": "always-multi-line",

    "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-pseudo-class-case": "lower",
    "selector-pseudo-class-parentheses-space-inside": "never",
    "selector-pseudo-element-case": "lower",
    "selector-pseudo-element-colon-notation": "double",
    "selector-pseudo-element-no-unknown": true,
    "selector-type-case": "lower",
    "selector-no-id": true
  }
}