gulp.js

var pipe = lazypipe()
  .pipe($.inlineCss)
  .pipe($.inject, gulp.src(cssMqPath), {
    transform: function(path, file) {
      return '<style>\n' + file.contents.toString() + '\n</style>';
    }
  })
  .pipe($.htmlmin, {
    collapseWhitespace: false,
    minifyCSS: true
  });