# csslint > A linter for CSS code. > More information: . - Lint a single CSS file: `csslint {{file.css}}` - Lint multiple CSS files: `csslint {{file1.css}} {{file2.css}} {{file3.css}}` - List all possible style rules: `csslint --list-rules` - Specify certain rules as errors (which result in a non-zero exit code): `csslint --errors={{errors,universal-selector,imports}} {{file.css}}` - Specify certain rules as warnings: `csslint --warnings={{box-sizing,selector-max,floats}} {{file.css}}` - Specify certain rules to ignore: `csslint --ignore={{ids,rules-count,shorthand}} {{file.css}}`