diff --git a/config/commands/lint.yml b/config/commands/lint.yml
index 251d160ce..56f30c171 100644
--- a/config/commands/lint.yml
+++ b/config/commands/lint.yml
@@ -21,3 +21,7 @@ command:
         extensions: ${toolkit.lint.php.extensions}
         exclude: ${toolkit.lint.php.exclude}
         options: ${toolkit.lint.php.options}
+    lint-css:
+      options:
+        config: ${toolkit.lint.css.config}
+        files: ${toolkit.lint.css.files}
diff --git a/config/runner/toolkit-test.yml b/config/runner/toolkit-test.yml
index bfd55fea1..3a3493285 100644
--- a/config/runner/toolkit-test.yml
+++ b/config/runner/toolkit-test.yml
@@ -92,7 +92,7 @@ toolkit:
   lint:
     eslint:
       config: .eslintrc.json
-      packages: 'eslint-config-drupal eslint-plugin-yml'
+      packages: 'eslint-config-drupal eslint-plugin-yml stylelint stylelint-config-drupal'
       ignores: [ '${toolkit.build.dist.root}/*', '.cache/*', 'vendor/*', 'web/*', 'dist/*' ]
       extensions_yaml: [ '.yml', '.yaml' ]
       options_yaml: ''
@@ -102,6 +102,9 @@ toolkit:
       extensions: [ 'php', 'module', 'inc', 'theme', 'install' ]
       exclude: [ '${toolkit.build.dist.root}/', '.cache/', 'vendor/', 'web/' ]
       options: ''
+    css:
+      config: .stylelintrc.json
+      files: '"${toolkit.build.custom-code-folder}/themes/*/css/*.css" "!${toolkit.build.custom-code-folder}/themes/*/css/*.min.css"'
   axe-scan:
     config: axe-scan.config.json
     urls:
diff --git a/src/TaskRunner/Commands/LintCommands.php b/src/TaskRunner/Commands/LintCommands.php
index e5b704e6e..67bd9f777 100644
--- a/src/TaskRunner/Commands/LintCommands.php
+++ b/src/TaskRunner/Commands/LintCommands.php
@@ -27,8 +27,6 @@ public function getConfigurationFile()
     /**
      * Setup the ESLint configurations and dependencies.
      *
-     * Check configurations at config/default.yml - 'toolkit.lint.eslint'.
-     *
      * @command toolkit:setup-eslint
      *
      * @option config      The eslint config file.
@@ -36,14 +34,12 @@ public function getConfigurationFile()
      * @option drupal-root The drupal root.
      * @option packages    The npm packages to install.
      * @option force       If true, the config file will be deleted.
-     *
-     * @return int
      */
     public function toolkitSetupEslint(array $options = [
-        'config' => InputOption::VALUE_OPTIONAL,
+        'config' => InputOption::VALUE_REQUIRED,
         'ignores' => InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY,
-        'drupal-root' => InputOption::VALUE_OPTIONAL,
-        'packages' => InputOption::VALUE_OPTIONAL,
+        'drupal-root' => InputOption::VALUE_REQUIRED,
+        'packages' => InputOption::VALUE_REQUIRED,
         'force' => false,
     ])
     {
@@ -139,8 +135,6 @@ private function generateEslintConfigurations(string $config, array $options)
     /**
      * Run lint YAML.
      *
-     * Check configurations at config/default.yml - 'toolkit.lint.eslint'.
-     *
      * @command toolkit:lint-yaml
      *
      * @option config     The eslint config file.
@@ -165,8 +159,6 @@ public function toolkitLintYaml(array $options = [
     /**
      * Run lint JS.
      *
-     * Check configurations at config/default.yml - 'toolkit.lint.eslint'.
-     *
      * @command toolkit:lint-js
      *
      * @option config     The eslint config file.
@@ -225,8 +217,6 @@ private function toolkitRunEsLint(string $config, array $extensions, string $opt
     /**
      * Run lint PHP.
      *
-     * Check configurations at config/default.yml - 'toolkit.lint.php'.
-     *
      * @command toolkit:lint-php
      *
      * @option exclude    The eslint config file.
@@ -266,4 +256,43 @@ public function toolkitLintPhp(array $options = [
         return $result->getExitCode();
     }
 
+    /**
+     * Run lint CSS.
+     *
+     * @command toolkit:lint-css
+     *
+     * @option exclude The stylelint config file.
+     * @option files   The files to check.
+     *
+     * @aliases tk-css
+     */
+    public function toolkitLintCss(array $options = [
+        'config' => InputOption::VALUE_REQUIRED,
+        'files' => InputOption::VALUE_REQUIRED,
+    ])
+    {
+        $tasks = [];
+
+        // Make sure eslint is properly installed.
+        $tasks[] = $this->taskExec($this->getBin('run'))->arg('toolkit:setup-eslint');
+
+        // Make sure the stylelint-config-drupal and stylelint are installed.
+        $tasks[] = $this->taskExecStack()
+            ->exec('npm -v || npm i npm')
+            ->exec('[ -f package.json ] || npm init -y --scope')
+            ->exec('npm list stylelint-config-drupal && npm update stylelint-config-drupal || npm install stylelint-config-drupal -y');
+
+        // Generate the config file if missing.
+        if (!file_exists($options['config'])) {
+            $data = ['extends' => 'stylelint-config-drupal'];
+            $tasks[] = $this->taskWriteToFile($options['config'])
+                ->text(json_encode($data, JSON_PRETTY_PRINT));
+        }
+
+        $tasks[] = $this->taskExec($this->getNodeBinPath('stylelint'))
+            ->rawArg($options['files']);
+
+        return $this->collectionBuilder()->addTaskList($tasks);
+    }
+
 }
diff --git a/tests/fixtures/commands/lint.yml b/tests/fixtures/commands/lint.yml
index 8944e32ea..1c7fde4b0 100644
--- a/tests/fixtures/commands/lint.yml
+++ b/tests/fixtures/commands/lint.yml
@@ -5,8 +5,8 @@
     - contains: |
         [Simulator] Simulating Exec('npm ini -y')
         [Simulator] Running npm ini -y
-        [Simulator] Simulating Exec('npm install --save-dev eslint-config-drupal eslint-plugin-yml -y')
-        [Simulator] Running npm install --save-dev eslint-config-drupal eslint-plugin-yml -y
+        [Simulator] Simulating Exec('npm install --save-dev eslint-config-drupal eslint-plu ... nt-config-drupal -y')
+        [Simulator] Running npm install --save-dev eslint-config-drupal eslint-plugin-yml stylelint stylelint-config-drupal -y
         [File\Write] Writing to .eslintrc.json.
         [Simulator] Simulating File\Write('.prettierignore')
           ->text('*.yml')
@@ -34,8 +34,8 @@
         [Simulator] Running rm .eslintrc.json
         [Simulator] Simulating Exec('npm ini -y')
         [Simulator] Running npm ini -y
-        [Simulator] Simulating Exec('npm install --save-dev eslint-config-drupal eslint-plugin-yml -y')
-        [Simulator] Running npm install --save-dev eslint-config-drupal eslint-plugin-yml -y
+        [Simulator] Simulating Exec('npm install --save-dev eslint-config-drupal eslint-plu ... nt-config-drupal -y')
+        [Simulator] Running npm install --save-dev eslint-config-drupal eslint-plugin-yml stylelint stylelint-config-drupal -y
         [Simulator] Simulating File\Write('.prettierignore')
           ->text('*.yml')