.stylelintrc

{
  "rules": {
    "color-hex-case": "upper",
    "color-hex-length": "long",
    "color-no-invalid-hex": true,

    "font-family-name-quotes": "always-unless-keyword",

    "font-weight-notation": "named-where-possible",

    "function-calc-no-unspaced-operator": true,
    "function-comma-space-after": "always",
    "function-comma-space-before": "never",
    "function-linear-gradient-no-nonstandard-direction": true,
    "function-parentheses-newline-inside": "never-multi-line",
    "function-parentheses-space-inside": "never",
    "function-url-quotes": "always",
    "function-whitespace-after": "always",

    "number-leading-zero": "always",
    "number-max-precision": 2,
    "number-no-trailing-zeros": true,
    "length-zero-no-unit": true,

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

    "value-no-vendor-prefix": true,
    "value-list-comma-newline-before": "never-multi-line",
    "value-list-comma-space-after": "always-single-line",
    "value-list-comma-space-before": "never",

    "custom-property-no-outside-root": true,

    "property-no-vendor-prefix": true,

    "declaration-bang-space-after": "never",
    "declaration-bang-space-before": "always",
    "declaration-colon-space-after": "always-single-line",
    "declaration-colon-space-before": "never",
    "declaration-no-important": true,

    "declaration-block-no-duplicate-properties": true,
    "declaration-block-no-shorthand-property-overrides": true,
    "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-block-trailing-semicolon": "always",

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

    "selector-combinator-space-after": "always",
    "selector-combinator-space-before": "always",
    "selector-max-specificity": "0,4,0",
    "selector-no-id": true,
    "selector-no-universal": true,
    "selector-no-vendor-prefix": true,
    "selector-pseudo-element-colon-notation": "double",
    "selector-root-no-composition": true,

    "selector-list-comma-newline-after": "always",
    "selector-list-comma-newline-before": "never-multi-line",

    "root-no-standard-properties": true,

    "rule-nested-empty-line-before": [
      "always", {
        "except": [
          "first-nested"
        ],
        "ignore": [
          "after-comment"
        ]
      }
    ],
    "rule-non-nested-empty-line-before": [
      "always", {
        "ignore": [
          "after-comment"
        ]
      }
    ],

    "media-feature-colon-space-after": "always",
    "media-feature-colon-space-before": "never",
    "media-feature-name-no-vendor-prefix": true,
    "media-feature-no-missing-punctuation": true,
    "media-feature-range-operator-space-after": "always",
    "media-feature-range-operator-space-before": "always",

    "at-rule-empty-line-before": [
      "always", {
        "except": [
          "first-nested",
          "blockless-group"
        ],
        "ignore": [
          "after-comment"
        ]
      }
    ],
    "at-rule-no-vendor-prefix": true,

    "comment-empty-line-before": [
      "always", {
        "ignore": [
          "between-comments"
        ]
      }
    ],
    "comment-whitespace-inside": "always",

    "indentation": 2,
    "max-line-length": 120,
    "max-nesting-depth": 3,
    "no-duplicate-selectors": true,
    "no-eol-whitespace": true,
    "no-unknown-animations": true,
    "no-unsupported-browser-features": [
      true, {
        "browsers": "last 2 versions, Android >= 4.2, not ie < 11",
        "ignore": [
          "flexbox"
        ]
      }
    ]
  }
}