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- Use a consistent format for all alpha-values (this rule didn't require any code changes); see https://stylelint.io/user-guide/rules/alpha-value-notation - Use modern and slightly shorter color notation, since [according to MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgb#browser_compatibility) that should be supported "everywhere" nowadays; see https://stylelint.io/user-guide/rules/color-function-notation/ - Use "short" hexadecimal colors whenever possible; see https://stylelint.io/user-guide/rules/color-hex-length/ - Help avoid adding broken hexadecimal colors (this rule didn't require any code changes); see https://stylelint.io/user-guide/rules/color-no-invalid-hex/