CSSLint

CSSLint is an open source CSS code quality tool originally written by Nicholas C. Zakas and Nicole Sullivan. It is a tool to help point out problems with your CSS code.

http://csslint.net/

Enabling CSSLint

If you have a .csslintrc file in your repository, you can configure CSSLint by adding the following lines to your configuration:

build:
  nodes:
    analysis:
      tests:
        override:
          - csslint-run [file|dir]

csslint-run is a built-in wrapper for CSSLint which takes care of results and output format, however all the options of CSSLint are supported as well. For example:

csslint-run --config=<config>