diff --git a/back_to_top.module b/back_to_top.module
index 943f352..a3a849d 100644
--- a/back_to_top.module
+++ b/back_to_top.module
@@ -7,12 +7,12 @@
 function back_to_top_page_attachments(array &$attachments) {
   $config = \Drupal::config('back_to_top.settings');
   $settings = $config->get();
-  $button_settings = array(
+  $button_settings = [
     'back_to_top_prevent_on_mobile' => $settings['back_to_top_prevent_on_mobile'],
     'back_to_top_prevent_in_admin' => $settings['back_to_top_prevent_in_admin'],
     'back_to_top_button_type' => $settings['back_to_top_button_type'],
     'back_to_top_button_text' => $settings['back_to_top_button_text'],
-  );
+  ];
   if ($settings['back_to_top_prevent_on_mobile'] && (is_mobile())) {
     return FALSE;
   }
@@ -113,7 +113,7 @@ function is_mobile() {
     return TRUE;
   }
   if (isset($_SERVER["HTTP_USER_AGENT"])) {
-    $user_agents = array(
+    $user_agents = [
       "midp",
       "j2me",
       "iphone",
@@ -184,7 +184,7 @@ function is_mobile() {
       "android",
       "ipod",
       "webos"
-    );
+    ];
 
     foreach ($user_agents as $user_string) {
       if (preg_match("/" . $user_string . "/i", strtolower($_SERVER["HTTP_USER_AGENT"]))) {
diff --git a/src/Form/BackToTopSettingsForm.php b/src/Form/BackToTopSettingsForm.php
index a719bd6..0c39004 100644
--- a/src/Form/BackToTopSettingsForm.php
+++ b/src/Form/BackToTopSettingsForm.php
@@ -35,37 +35,37 @@ class BackToTopSettingsForm extends ConfigFormBase {
     $form['#attached']['library'][] = 'core/jquery.farbtastic';
     $form['#attached']['library'][] = 'back_to_top/back_to_top';
 
-    $form['back_to_top_prevent_on_mobile'] = array(
+    $form['back_to_top_prevent_on_mobile'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Prevent on mobile and touch devices'),
       '#description' => $this->t('Do you want to prevent Back To Top on touch devices?'),
       '#default_value' => $settings['back_to_top_prevent_on_mobile'],
-    );
-    $form['back_to_top_prevent_in_admin'] = array(
+    ];
+    $form['back_to_top_prevent_in_admin'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Prevent on administration pages and node edit'),
       '#description' => $this->t('Do you want to prevent Back To Top on admin pages?'),
       '#default_value' => $settings['back_to_top_prevent_in_admin'],
-    );
-    $form['back_to_top_prevent_in_front'] = array(
+    ];
+    $form['back_to_top_prevent_in_front'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Prevent on front page'),
       '#description' => $this->t('Do you want to prevent Back To Top on front page?'),
       '#default_value' => $settings['back_to_top_prevent_in_front'],
-    );
-    $form['back_to_top_button_trigger'] = array(
+    ];
+    $form['back_to_top_button_trigger'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Trigger'),
       '#description' => $this->t('Set the number of pixel which trigger the Back To Top button default 100'),
       '#default_value' => $settings['back_to_top_button_trigger'],
       '#size' => 10,
       '#maxlength' => 4,
-    );
-    $form['back_to_top_button_place'] = array(
+    ];
+    $form['back_to_top_button_place'] = [
       '#title' => $this->t('Placement'),
       '#description' => $this->t('Where should the Back To Top button appear?'),
       '#type' => 'select',
-      '#options' => array(
+      '#options' => [
         1 => $this->t('Bottom right'),
         2 => $this->t('Bottom left'),
         3 => $this->t('Botton center'),
@@ -75,35 +75,35 @@ class BackToTopSettingsForm extends ConfigFormBase {
         7 => $this->t('Mid right'),
         8 => $this->t('Mid left'),
         9 => $this->t('Mid center'),
-      ),
+      ],
       '#default_value' => $settings['back_to_top_button_place'],
-    );
-    $form['back_to_top_button_text'] = array(
+    ];
+    $form['back_to_top_button_text'] = [
       '#type' => 'textfield',
       '#title' => 'Button text',
       '#description' => 'Set the text of the Back To Top button',
       '#default_value' => $settings['back_to_top_button_text'],
       '#size' => 30,
       '#maxlength' => 30,
-    );
-    $form['back_to_top_button_type'] = array(
+    ];
+    $form['back_to_top_button_type'] = [
       '#type' => 'radios',
       '#title' => $this->t('Do you want Back To Top to use a PNG-24 image or a Text/Css button?'),
-      '#options' => array(
+      '#options' => array[
         'image' => $this->t('Image (default)'),
         'text' => $this->t('Text/Css'),
-      ),
+      ],
       '#default_value' => $settings['back_to_top_button_type'],
-    );
+    ];
 
     // Wrap Text/Css button settings in a fieldset.
-    $form['text_button'] = array(
+    $form['text_button'] = [
       '#type' => 'fieldset',
       '#title' => $this->t('Text/Css button settings'),
       '#collapsible' => TRUE,
       '#collapsed' => ($form['back_to_top_button_type']['#default_value'] == 'image' ? TRUE : FALSE),
-    );
-    $form['text_button']['back_to_top_bg_color'] = array(
+    ];
+    $form['text_button']['back_to_top_bg_color'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Background color'),
       '#description' => $this->t('Button background color default #F7F7F7'),
@@ -111,8 +111,8 @@ class BackToTopSettingsForm extends ConfigFormBase {
       '#size' => 10,
       '#maxlength' => 7,
       '#suffix' => '<div class="color-field" id="back_to_top_bg_color"></div>',
-    );
-    $form['text_button']['back_to_top_border_color'] = array(
+    ];
+    $form['text_button']['back_to_top_border_color'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Border color'),
       '#description' => $this->t('Border color default #CCCCCC'),
@@ -120,8 +120,8 @@ class BackToTopSettingsForm extends ConfigFormBase {
       '#size' => 10,
       '#maxlength' => 7,
       '#suffix' => '<div class="color-field" id="back_to_top_border_color"></div>',
-    );
-    $form['text_button']['back_to_top_hover_color'] = array(
+    ];
+    $form['text_button']['back_to_top_hover_color'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Hover color'),
       '#description' => $this->t('Hover color default #EEEEEE'),
@@ -129,8 +129,8 @@ class BackToTopSettingsForm extends ConfigFormBase {
       '#size' => 10,
       '#maxlength' => 7,
       '#suffix' => '<div class="color-field" id="back_to_top_hover_color"></div>',
-    );
-    $form['text_button']['back_to_top_text_color'] = array(
+    ];
+    $form['text_button']['back_to_top_text_color'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Text color'),
       '#description' => $this->t('Text color default #333333'),
@@ -138,7 +138,7 @@ class BackToTopSettingsForm extends ConfigFormBase {
       '#size' => 10,
       '#maxlength' => 7,
       '#suffix' => '<div class="color-field" id="back_to_top_text_color"></div>',
-    );
+    ];
 
     return parent::buildForm($form, $form_state);
   }