diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
index d061495..6454766 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesListForm.php
@@ -179,6 +179,7 @@ public function buildForm(array $form, array &$form_state) {
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
+      '#button_type' => 'primary',
       '#value' => $this->t('Save configuration'),
     );
 
diff --git a/core/modules/update/update.manager.inc b/core/modules/update/update.manager.inc
index 83203ae..3981b67 100644
--- a/core/modules/update/update.manager.inc
+++ b/core/modules/update/update.manager.inc
@@ -553,6 +553,7 @@ function update_manager_install_form($form, &$form_state, $context) {
   $form['actions'] = array('#type' => 'actions');
   $form['actions']['submit'] = array(
     '#type' => 'submit',
+    '#button_type' => 'primary',
     '#value' => t('Install'),
   );
 
diff --git a/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php b/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php
index 7eee62d..c3a7ba4 100644
--- a/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php
+++ b/core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php
@@ -172,7 +172,10 @@ public function buildForm(array $form, array &$form_state) {
     }
 
     $form['actions'] = array('#type' => 'actions');
-    $form['actions']['submit'] = array('#type' => 'submit', '#value' => $this->t('Save permissions'));
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#button_type' => 'primary',
+      '#value' => $this->t('Save permissions'));
 
     $form['#attached']['library'][] = 'user/drupal.user.permissions';
 
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ConfigHandler.php b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ConfigHandler.php
index 8533e69..3b85c35 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ConfigHandler.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/Form/Ajax/ConfigHandler.php
@@ -171,6 +171,7 @@ public function buildForm(array $form, array &$form_state) {
       $form['actions']['remove'] = array(
         '#type' => 'submit',
         '#value' => $this->t('Remove'),
+        '#button_type' => 'danger',
         '#submit' => array(array($this, 'remove')),
         '#limit_validation_errors' => array(array('override')),
         '#ajax' => array(
diff --git a/core/modules/views_ui/lib/Drupal/views_ui/ViewDeleteForm.php b/core/modules/views_ui/lib/Drupal/views_ui/ViewDeleteForm.php
index 6402190..3958617 100644
--- a/core/modules/views_ui/lib/Drupal/views_ui/ViewDeleteForm.php
+++ b/core/modules/views_ui/lib/Drupal/views_ui/ViewDeleteForm.php
@@ -33,9 +33,20 @@ public function getCancelRoute() {
   /**
    * {@inheritdoc}
    */
-  public function getConfirmText() {
-    return $this->t('Delete');
-  }
+  public function buildForm(array $form, array &$form_state) {
+    $form = parent::buildForm($form, $form_state);
+
+    $form['actions'] = array('#type' => 'actions');
+    $form['actions']['submit'] = array(
+      '#type' => 'submit',
+      '#button_type' => 'primary',
+      '#value' => $this->t('Delete')
+    );
+    $form['actions']['cancel'] = array(
+      '#type' => 'submit',
+      '#value' => $this->t('Cancel'),
+    );
+    return $form;
 
   /**
    * {@inheritdoc}
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index be30de6..587a9cc 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -49,6 +49,11 @@
  *
  * @see example.sites.php
  * @see conf_path()
+ *
+ * In addition to customizing application settings through variables in
+ * settings.php, you can create a services.yml file in the same directory to
+ * register custom, site-specific service definitions and/or swap out default
+ * implementations with custom ones.
  */
 
 /**