gruntfile.js

module.exports = function(grunt) {
  grunt.initConfig({
      uncss: {
          dist: {
              files: [{
                  nonull: true,
                  src: ['http://localhost:8000/', 'http://localhost:8000/login', 'http://localhost:8000/dashboard', 'http://127.0.0.1:8000/general-info/1/update/'],
                  dest: 'build/static/build/grunt.css'
              }]
          }, 
          options: {
              ignoreSheets : [/fonts.googleapis/, /cdn.jsdelivr.net/],
              stylesheets: ['/static/build/style.css', '/static/build/bootstrap/css/bootstrap.css'],
              report: 'gzip'
          }
      },
  });

  // Load the plugins
  grunt.loadNpmTasks('grunt-uncss');

  // Default tasks.
  grunt.registerTask('default', ['uncss']);

};