diff --git a/README.txt b/README.txt
index cdc85a4..2db130a 100644
--- a/README.txt
+++ b/README.txt
@@ -4,17 +4,17 @@ from the front-end. You don't need to open any file for this purpose.
 
 INSTALLATION INSTRUCTIONS
 -------------------------
-1.  Copy the files included in the tarball into a directory named "header_and_footer_scripts" in
-    your Drupal modules/ directory.
-2.  Login as site administrator.
-3.  Enable the HFS (Header Footer Scripts) module on the Administer -> Modules
-    page.
-4.  Add styles and scripts in settings on the Administer -> Configuration -> 
-    Development -> HFS (Header Footer Scripts) Page.
-5.  Enjoy.
+1. Copy the files included in the tarball into a directory named
+   "header_and_footer_scripts" in your Drupal modules/ directory.
+2. Login as site administrator.
+3. Enable the HFS (Header Footer Scripts) module on the 
+   Administer -> Modules page.
+4. Add styles and scripts in settings on the Administer ->
+   Configuration -> Development -> HFS (Header Footer Scripts) Page.
+5. Enjoy.
 
 NOTES
 -----
-This module adds the styles and scripts on all over the site. There are 2
-setting pages.
+This module adds the styles and scripts on all over the site.
+There are 2 setting pages.
 These setting pages are allow you add the scripts in the desired region.
diff --git a/header_and_footer_scripts.install b/header_and_footer_scripts.install
index 52e2ea8..32a8802 100644
--- a/header_and_footer_scripts.install
+++ b/header_and_footer_scripts.install
@@ -9,6 +9,10 @@
  * Implements hook_uninstall().
  */
 function header_and_footer_scripts_uninstall() {
-  \Drupal::service('config.factory')->getEditable('hfs_body_scripts.settings')->delete();
-  \Drupal::service('config.factory')->getEditable('hfs_footer_scripts.settings')->delete();
+  \Drupal::service('config.factory')
+    ->getEditable('hfs_body_scripts.settings')
+    ->delete();
+  \Drupal::service('config.factory')
+    ->getEditable('hfs_footer_scripts.settings')
+    ->delete();
 }
diff --git a/header_and_footer_scripts.links.menu.yml b/header_and_footer_scripts.links.menu.yml
index efd2177..542b6b0 100644
--- a/header_and_footer_scripts.links.menu.yml
+++ b/header_and_footer_scripts.links.menu.yml
@@ -2,4 +2,4 @@ hfs.admin.body_settings:
   title: 'HFS (Header Footer Scripts)'
   description: 'Allow to add scripts and styles from the frontend at the start of body tag.'
   parent: system.admin_config_development
-  route_name: hfs.admin.body_settings
\ No newline at end of file
+  route_name: hfs.admin.body_settings
diff --git a/header_and_footer_scripts.links.task.yml b/header_and_footer_scripts.links.task.yml
index bdfb3eb..77710e1 100644
--- a/header_and_footer_scripts.links.task.yml
+++ b/header_and_footer_scripts.links.task.yml
@@ -5,4 +5,4 @@ hfs.admin.body_settings:
 hfs.admin.footer_settings:
   route_name: hfs.admin.footer_settings
   title: 'Footer Scripts'
-  base_route: hfs.admin.body_settings
\ No newline at end of file
+  base_route: hfs.admin.body_settings
diff --git a/header_and_footer_scripts.module b/header_and_footer_scripts.module
index 3568cef..f53c1f7 100644
--- a/header_and_footer_scripts.module
+++ b/header_and_footer_scripts.module
@@ -2,38 +2,44 @@
 
 /**
  * @file
- * Enables Drupal to add scripts and styles from frontend on all over the site.
+ * Enables Drupal to add scripts and styles from frontend
+ * on all over the site.
  */
 
 /**
  * Implements hook_page_top().
  *
- * Add scripts after the body tag on overall the site which are defined on the settings page.
+ * Add scripts after the body tag on overall the site
+ * which are defined on the settings page.
  */
 function header_and_footer_scripts_page_top(array &$page_top) {
-  $body_section  = \Drupal::config('hfs_body_scripts.settings')->get();
+  $body_section = \Drupal::config('hfs_body_scripts.settings')->get();
   if (isset($body_section['styles']) && !empty($body_section['styles'])) {
     $output_styles = preg_split("/(<\/style>|\/>)/", $body_section['styles']);
     $i = 1;
     foreach ($output_styles as $row) {
 
-      if (empty($row)) continue;
+      if (empty($row)) {
+        continue;
+      }
 
       $style_tag  = 'style';
       $style_attr = '';
-      $value       = '';
+      $value      = '';
 
       $style_attributes = preg_replace('/(<style|<link)/', '', $row, 1);
       $get_style_attr   = preg_split('/(>)/', $style_attributes, 2);
 
-      if (isset($get_style_attr[1]))
+      if (isset($get_style_attr[1])) {
         $value = $get_style_attr[1];
+      }
 
       $get_style_tag = preg_split('/<link/', $row, 2);
 
-      if (isset($get_style_tag[1]))
-        $style_tag  = 'link';
-      
+      if (isset($get_style_tag[1])) {
+        $style_tag = 'link';
+      }
+
       if (isset($get_style_attr[0]) && !empty($get_style_attr[0])) {
         $get_attr   = preg_replace('/(\'|\")/', '', $get_style_attr[0]);
         $get_attr   = preg_replace('/\s+/', ',', $get_attr);
@@ -41,23 +47,27 @@ function header_and_footer_scripts_page_top(array &$page_top) {
         $fetch_attr = explode(',', $get_attr);
 
         foreach ($fetch_attr as $attr) {
-          if (empty($attr)) continue;
-          
+          if (empty($attr)) {
+            continue;
+          }
+
           $attr_key_value = explode('=', $attr);
-          if (isset($attr_key_value[0]) && isset($attr_key_value[1]))
+          if (isset($attr_key_value[0]) && isset($attr_key_value[1])) {
             $style_attr[$attr_key_value[0]] = $attr_key_value[1];
-          else
+          } else {
             $style_attr[$attr_key_value[0]] = $attr_key_value[0];
+          }
         }
       }
 
-      $page_top['top_styles_'.$i] = [
-        '#type'       => 'html_tag',
-        '#tag'        => $style_tag,
-        '#value'      => $value
+      $page_top['top_styles_' . $i] = [
+        '#type'  => 'html_tag',
+        '#tag'   => $style_tag,
+        '#value' => $value,
       ];
-      if (is_array($style_attr))
-        $page_top['top_styles_'.$i]['#attributes'] = $style_attr;
+      if (is_array($style_attr)) {
+        $page_top['top_styles_' . $i]['#attributes'] = $style_attr;
+      }
       $i++;
     }
   }
@@ -66,22 +76,26 @@ function header_and_footer_scripts_page_top(array &$page_top) {
     $i = 1;
     foreach ($output_scripts as $row) {
 
-      if (empty($row)) continue;
+      if (empty($row)) {
+        continue;
+      }
 
       $script_tag  = 'script';
       $script_attr = '';
       $value       = '';
-      
+
       $script_attributes = preg_replace('/(<script|<noscript)/', '', $row, 1);
       $get_script_attr   = preg_split('/(>)/', $script_attributes, 2);
 
-      if (isset($get_script_attr[1]))
+      if (isset($get_script_attr[1])) {
         $value = $get_script_attr[1];
+      }
 
       $get_script_tag = preg_split('/<noscript/', $row, 2);
 
-      if (isset($get_script_tag[1]))
-        $script_tag  = 'noscript';
+      if (isset($get_script_tag[1])) {
+        $script_tag = 'noscript';
+      }
 
       if (isset($get_script_attr[0]) && !empty($get_script_attr[0])) {
         $get_attr   = preg_replace('/(\'|\")/', '', $get_script_attr[0]);
@@ -90,23 +104,27 @@ function header_and_footer_scripts_page_top(array &$page_top) {
         $fetch_attr = explode(',', $get_attr);
 
         foreach ($fetch_attr as $attr) {
-          if (empty($attr)) continue;
-          
+          if (empty($attr)) {
+            continue;
+          }
+
           $attr_key_value = explode('=', $attr);
-          if (isset($attr_key_value[0]) && isset($attr_key_value[1]))
+          if (isset($attr_key_value[0]) && isset($attr_key_value[1])) {
             $script_attr[$attr_key_value[0]] = $attr_key_value[1];
-          else
+          } else {
             $script_attr[$attr_key_value[0]] = $attr_key_value[0];
+          }
         }
       }
 
-      $page_top['top_scripts_'.$i] = [
-        '#type'       => 'html_tag',
-        '#tag'        => $script_tag,
-        '#value'      => $value
+      $page_top['top_scripts_' . $i] = [
+        '#type'  => 'html_tag',
+        '#tag'   => $script_tag,
+        '#value' => $value,
       ];
-      if (is_array($script_attr))
+      if (is_array($script_attr)) {
         $page_top['top_scripts_'.$i]['#attributes'] = $script_attr;
+      }
       $i++;
     }
   }
@@ -115,7 +133,8 @@ function header_and_footer_scripts_page_top(array &$page_top) {
 /**
  * Implements hook_page_bottom().
  *
- * Add scripts before the Footer tag on overall the site which are defined on the settings page.
+ * Add scripts before the Footer tag on overall the site
+ * which are defined on the settings page.
  */
 function header_and_footer_scripts_page_bottom(array &$page_bottom) {
   $footer_section = \Drupal::config('hfs_footer_scripts.settings')->get();
@@ -124,22 +143,26 @@ function header_and_footer_scripts_page_bottom(array &$page_bottom) {
     $i = 1;
     foreach ($output_styles as $row) {
 
-      if (empty($row)) continue;
+      if (empty($row)) {
+        continue;
+      }
 
       $style_tag  = 'style';
       $style_attr = '';
-      $value       = '';
+      $value      = '';
 
       $style_attributes = preg_replace('/(<style|<link)/', '', $row, 1);        
       $get_style_attr   = preg_split('/(>)/', $style_attributes, 2);
 
-      if (isset($get_style_attr[1]))
+      if (isset($get_style_attr[1])) {
         $value = $get_style_attr[1];
+      }
 
       $get_style_tag = preg_split('/<link/', $row, 2);
 
-      if (isset($get_style_tag[1]))
-        $style_tag  = 'link';
+      if (isset($get_style_tag[1])) {
+        $style_tag = 'link';
+      }
 
       if (isset($get_style_attr[0]) && !empty($get_style_attr[0])) {
         $get_attr   = preg_replace('/(\'|\")/', '', $get_style_attr[0]);
@@ -148,23 +171,27 @@ function header_and_footer_scripts_page_bottom(array &$page_bottom) {
         $fetch_attr = explode(',', $get_attr);
 
         foreach ($fetch_attr as $attr) {
-          if (empty($attr)) continue;
+          if (empty($attr)) {
+            continue;
+          }
 
           $attr_key_value = explode('=', $attr);
-          if (isset($attr_key_value[0]) && isset($attr_key_value[1]))
+          if (isset($attr_key_value[0]) && isset($attr_key_value[1])) {
             $style_attr[$attr_key_value[0]] = $attr_key_value[1];
-          else
+          } else {
             $style_attr[$attr_key_value[0]] = $attr_key_value[0];
+          }
         }
       }
 
-      $page_bottom['bottom_styles_'.$i] = [
-        '#type'       => 'html_tag',
-        '#tag'        => $style_tag,
-        '#value'      => $value
+      $page_bottom['bottom_styles_' . $i] = [
+        '#type'  => 'html_tag',
+        '#tag'   => $style_tag,
+        '#value' => $value,
       ];
-      if (is_array($style_attr))
-        $page_bottom['bottom_styles_'.$i]['#attributes'] = $style_attr;
+      if (is_array($style_attr)) {
+        $page_bottom['bottom_styles_' . $i]['#attributes'] = $style_attr;
+      }
       $i++;
     }
   }
@@ -182,13 +209,15 @@ function header_and_footer_scripts_page_bottom(array &$page_bottom) {
       $script_attributes = preg_replace('/(<script|<noscript)/', '', $row, 1);        
       $get_script_attr   = preg_split('/(>)/', $script_attributes, 2);
 
-      if (isset($get_script_attr[1]))
+      if (isset($get_script_attr[1])) {
         $value = $get_script_attr[1];
+      }
 
       $get_script_tag = preg_split('/<noscript/', $row, 2);
 
-      if (isset($get_script_tag[1]))
-        $script_tag  = 'noscript';
+      if (isset($get_script_tag[1])) {
+        $script_tag = 'noscript';
+      }
 
       if (isset($get_script_attr[0]) && !empty($get_script_attr[0])) {
         $get_attr   = preg_replace('/(\'|\")/', '', $get_script_attr[0]);
@@ -197,23 +226,27 @@ function header_and_footer_scripts_page_bottom(array &$page_bottom) {
         $fetch_attr = explode(',', $get_attr);
 
         foreach ($fetch_attr as $attr) {
-          if (empty($attr)) continue;
+          if (empty($attr)) {
+            continue;
+          }
 
           $attr_key_value = explode('=', $attr);
-          if (isset($attr_key_value[0]) && isset($attr_key_value[1]))
+          if (isset($attr_key_value[0]) && isset($attr_key_value[1])) {
             $script_attr[$attr_key_value[0]] = $attr_key_value[1];
-          else
+          } else {
             $script_attr[$attr_key_value[0]] = $attr_key_value[0];
+          }
         }
       }
 
-      $page_bottom['bottom_scripts_'.$i] = [
-        '#type'       => 'html_tag',
-        '#tag'        => $script_tag,
-        '#value'      => $value
+      $page_bottom['bottom_scripts_' . $i] = [
+        '#type'  => 'html_tag',
+        '#tag'   => $script_tag,
+        '#value' => $value,
       ];
-      if (is_array($script_attr))
-        $page_bottom['bottom_scripts_'.$i]['#attributes'] = $script_attr;
+      if (is_array($script_attr)) {
+        $page_bottom['bottom_scripts_' . $i]['#attributes'] = $script_attr;
+      }
       $i++;
     }
   }
diff --git a/header_and_footer_scripts.permissions.yml b/header_and_footer_scripts.permissions.yml
index 84683cc..0430af4 100644
--- a/header_and_footer_scripts.permissions.yml
+++ b/header_and_footer_scripts.permissions.yml
@@ -1,4 +1,4 @@
 header_and_footer_scripts_settings:
   title: 'Add Scripts all over the site'
   description: 'Users who have this permission can add and remove the scripts from the site.'
-  restrict access: TRUE
\ No newline at end of file
+  restrict access: TRUE
diff --git a/header_and_footer_scripts.routing.yml b/header_and_footer_scripts.routing.yml
index a124b7d..da12aad 100644
--- a/header_and_footer_scripts.routing.yml
+++ b/header_and_footer_scripts.routing.yml
@@ -11,4 +11,4 @@ hfs.admin.footer_settings:
     _form: '\Drupal\header_and_footer_scripts\Form\FooterForm'
     _title: 'HFS (Header Footer Scripts) for Footer'
   requirements:
-    _permission: 'header_and_footer_scripts_settings'
\ No newline at end of file
+    _permission: 'header_and_footer_scripts_settings'
diff --git a/src/Form/BodyForm.php b/src/Form/BodyForm.php
index 8bd4682..0e3c985 100644
--- a/src/Form/BodyForm.php
+++ b/src/Form/BodyForm.php
@@ -6,48 +6,52 @@ use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\HttpFoundation\Request;
 use Drupal\Core\Form\FormStateInterface;
 
+/**
+ * This Class Provides the settings page for adding CSS/JS after the body tag on the site.
+ */
 class BodyForm extends ConfigFormBase {
+  
   /**
-   * Implements FormBuilder::getFormId
+   * Implements FormBuilder::getFormId.
    */
   public function getFormId() {
     return 'hfs_body_settings';
   }
 
   /**
-   * Implements ConfigFormBase::getEditableConfigNames
+   * Implements ConfigFormBase::getEditableConfigNames.
    */
   protected function getEditableConfigNames() {
     return ['hfs_body_scripts.settings'];
   }
 
   /**
-   * Implements FormBuilder::buildForm
+   * Implements FormBuilder::buildForm.
    */
   public function buildForm(array $form, FormStateInterface $form_state, Request $request = NULL) {
-    $body_section = \Drupal::config('hfs_body_scripts.settings')->get();
+    $body_section = $this->config('hfs_body_scripts.settings')->get();
 
-      $form['hfs_body'] = array(
-        '#type'        => 'fieldset',
-        '#title'       => t('Add Scripts and Styles in body'),
-        '#description' => t('All the defined scripts and styles in this section would be added next to <strong>body</strong> tag.'),
-      );
+    $form['hfs_body'] = [
+      '#type'        => 'fieldset',
+      '#title'       => t('Add Scripts and Styles in body'),
+      '#description' => t('All the defined scripts and styles in this section would be added next to <strong>body</strong> tag.'),
+    ];
 
-      $form['hfs_body']['styles'] = array(
-        '#type'          => 'textarea',
-        '#title'         => t('Body Styles'),
-        '#default_value' => isset($body_section['styles']) ? $body_section['styles'] : '',
-        '#description'   => t('<p>You can add multiple <strong>stylesheets</strong> here with multiple ways, For example: </p><p>1. &lt;link type="text/css" rel="stylesheet" href="http://www.example.com/style.css" media="all" /&gt;</p><p> 2. &lt;link type="text/css" rel="stylesheet" href="/style.css" media="all" /&gt;</p><p> 3. &lt;style&gt;#header { color: grey; }&lt;/style&gt;</p>'),
-        '#rows'          => 10,
-      );
+    $form['hfs_body']['styles'] = [
+      '#type'          => 'textarea',
+      '#title'         => $this->t('Body Styles'),
+      '#default_value' => isset($body_section['styles']) ? $body_section['styles'] : '',
+      '#description'   => $this->t('<p>You can add multiple <strong>stylesheets</strong> here with multiple ways, For example: </p><p>1. &lt;link type="text/css" rel="stylesheet" href="http://www.example.com/style.css" media="all" /&gt;</p><p> 2. &lt;link type="text/css" rel="stylesheet" href="/style.css" media="all" /&gt;</p><p> 3. &lt;style&gt;#header { color: grey; }&lt;/style&gt;</p>'),
+      '#rows'          => 10,
+    ];
 
-      $form['hfs_body']['scripts'] = array(
-        '#type'          => 'textarea',
-        '#title'         => t('Body Scripts'),
-        '#default_value' => isset($body_section['scripts']) ? $body_section['scripts'] : '',
-        '#description'   => t('<p>On mostly sites, this section is used to add the <strong>Google Tag Manager</strong>. <strong>Like:</strong></p><p>1. &lt;!-- Google Tag Manager --&gt;&lt;noscript&gt;<strong>Write Your code here</strong>&lt;/script&gt;&lt;!-- End Google Tag Manager --&gt;</p><p>You can also add multiple <strong>scripts</strong> here with multiple ways, For example: </p><p>1. &lt;script type="text/javascript" src="http://www.example.com/script.js"&gt;&lt;/script&gt;</p><p> 2. &lt;script type="text/javascript" src="/script.js"&gt;&lt;/script&gt;</p><p> 3. &lt;script type="text/javascript"&gt;console.log("HFS Body");&lt;/script&gt;</p>'),
-        '#rows'          => 10,
-      );
+    $form['hfs_body']['scripts'] = [
+      '#type'          => 'textarea',
+      '#title'         => $this->t('Body Scripts'),
+      '#default_value' => isset($body_section['scripts']) ? $body_section['scripts'] : '',
+      '#description'   => $this->t('<p>On mostly sites, this section is used to add the <strong>Google Tag Manager</strong>. <strong>Like:</strong></p><p>1. &lt;!-- Google Tag Manager --&gt;&lt;noscript&gt;<strong>Write Your code here</strong>&lt;/script&gt;&lt;!-- End Google Tag Manager --&gt;</p><p>You can also add multiple <strong>scripts</strong> here with multiple ways, For example: </p><p>1. &lt;script type="text/javascript" src="http://www.example.com/script.js"&gt;&lt;/script&gt;</p><p> 2. &lt;script type="text/javascript" src="/script.js"&gt;&lt;/script&gt;</p><p> 3. &lt;script type="text/javascript"&gt;console.log("HFS Body");&lt;/script&gt;</p>'),
+      '#rows'          => 10,
+    ];
 
     return parent::buildForm($form, $form_state);
   }
@@ -60,11 +64,13 @@ class BodyForm extends ConfigFormBase {
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $values = $form_state->getValues();
 
-    \Drupal::service('config.factory')->getEditable('hfs_body_scripts.settings')
+    $this->configFactory()
+      ->getEditable('hfs_body_scripts.settings')
       ->set('styles', $values['styles'])
       ->set('scripts', $values['scripts'])
       ->save();
 
     drupal_set_message($this->t('Your Settings have been saved.'), 'status');
   }
+
 }
diff --git a/src/Form/FooterForm.php b/src/Form/FooterForm.php
index 8dd51c9..8ee8bae 100644
--- a/src/Form/FooterForm.php
+++ b/src/Form/FooterForm.php
@@ -6,48 +6,52 @@ use Drupal\Core\Form\ConfigFormBase;
 use Symfony\Component\HttpFoundation\Request;
 use Drupal\Core\Form\FormStateInterface;
 
+/**
+ * This Class Provides the settings page for adding CSS/JS before the end of body tag on the site.
+ */
 class FooterForm extends ConfigFormBase {
+
   /**
-   * Implements FormBuilder::getFormId
+   * Implements FormBuilder::getFormId.
    */
   public function getFormId() {
     return 'hfs_footer_settings';
   }
 
   /**
-   * Implements ConfigFormBase::getEditableConfigNames
+   * Implements ConfigFormBase::getEditableConfigNames.
    */
   protected function getEditableConfigNames() {
     return ['hfs_footer_scripts.settings'];
   }
 
   /**
-   * Implements FormBuilder::buildForm
+   * Implements FormBuilder::buildForm.
    */
   public function buildForm(array $form, FormStateInterface $form_state, Request $request = NULL) {
-    $footer_section = \Drupal::config('hfs_footer_scripts.settings')->get();
+    $footer_section =  $this->config('hfs_footer_scripts.settings')->get();
 
-    $form['hfs_footer'] = array(
+    $form['hfs_footer'] = [
       '#type'        => 'fieldset',
-      '#title'       => t('Add Scripts and Styles in Footer'),
-      '#description' => t('All the defined scripts and styles in this section would be added just before closing the <strong>body</strong> tag.'),
-    );
+      '#title'       => $this->t('Add Scripts and Styles in Footer'),
+      '#description' => $this->t('All the defined scripts and styles in this section would be added just before closing the <strong>body</strong> tag.'),
+    ];
 
-    $form['hfs_footer']['styles'] = array(
+    $form['hfs_footer']['styles'] = [
       '#type'          => 'textarea',
-      '#title'         => t('Footer Styles'),
+      '#title'         => $this->t('Footer Styles'),
       '#default_value' => isset($footer_section['styles']) ? $footer_section['styles'] : '',
-      '#description'   => t('<p>You can add multiple <strong>stylesheets</strong> here with multiple ways, For example: </p><p>1. &lt;link type="text/css" rel="stylesheet" href="http://www.example.com/style.css" media="all" /&gt;</p><p> 2. &lt;link type="text/css" rel="stylesheet" href="/style.css" media="all" /&gt;</p><p> 3. &lt;style&gt;#header { color: grey; }&lt;/style&gt;</p>'),
+      '#description'   => $this->t('<p>You can add multiple <strong>stylesheets</strong> here with multiple ways, For example: </p><p>1. &lt;link type="text/css" rel="stylesheet" href="http://www.example.com/style.css" media="all" /&gt;</p><p> 2. &lt;link type="text/css" rel="stylesheet" href="/style.css" media="all" /&gt;</p><p> 3. &lt;style&gt;#header { color: grey; }&lt;/style&gt;</p>'),
       '#rows'          => 10,
-    );
+    ];
 
-    $form['hfs_footer']['scripts'] = array(
+    $form['hfs_footer']['scripts'] = [
       '#type'          => 'textarea',
-      '#title'         => t('Footer Scripts'),
+      '#title'         => $this->t('Footer Scripts'),
       '#default_value' => isset($footer_section['scripts']) ? $footer_section['scripts'] : '',
-      '#description'   => t('<p>You can add multiple <strong>scripts</strong> here with multiple ways, For example: </p><p>1. &lt;script type="text/javascript" src="http://www.example.com/script.js"&gt;&lt;/script&gt;</p><p> 2. &lt;script type="text/javascript" src="/script.js"&gt;&lt;/script&gt;</p><p> 3. &lt;script type="text/javascript"&gt;console.log("HFS Footer");&lt;/script&gt;</p>'),
+      '#description'   => $this->t('<p>You can add multiple <strong>scripts</strong> here with multiple ways, For example: </p><p>1. &lt;script type="text/javascript" src="http://www.example.com/script.js"&gt;&lt;/script&gt;</p><p> 2. &lt;script type="text/javascript" src="/script.js"&gt;&lt;/script&gt;</p><p> 3. &lt;script type="text/javascript"&gt;console.log("HFS Footer");&lt;/script&gt;</p>'),
       '#rows'          => 10,
-    );
+    ];
 
     return parent::buildForm($form, $form_state);
   }
@@ -60,11 +64,13 @@ class FooterForm extends ConfigFormBase {
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $values = $form_state->getValues();
 
-    \Drupal::service('config.factory')->getEditable('hfs_footer_scripts.settings')
+    $this->configFactory()
+      ->getEditable('hfs_footer_scripts.settings')
       ->set('styles', $values['styles'])
       ->set('scripts', $values['scripts'])
       ->save();
 
     drupal_set_message($this->t('Your Settings have been saved.'), 'status');
   }
+
 }