diff --git a/config/schema/field_group.field_group_formatter_plugin.schema.yml b/config/schema/field_group.field_group_formatter_plugin.schema.yml
index 82b8f27..449fd97 100644
--- a/config/schema/field_group.field_group_formatter_plugin.schema.yml
+++ b/config/schema/field_group.field_group_formatter_plugin.schema.yml
@@ -55,6 +55,9 @@ field_group.field_group_formatter_plugin.html_element:
     label_element:
       type: string
       label: 'html element tag to be used for the label'
+    label_element_classes:
+      type: string
+      label: 'html classes to be used for the label'
     attributes:
       type: string
       label: 'html attributes for the element'
@@ -102,4 +105,4 @@ field_group.field_group_formatter_plugin.base:
       label:  'Classes of the fieldgroup'
     id:
       type: string
-      label: 'Html id of the fieldgroup'
\ No newline at end of file
+      label: 'Html id of the fieldgroup'
diff --git a/src/Plugin/field_group/FieldGroupFormatter/HtmlElement.php b/src/Plugin/field_group/FieldGroupFormatter/HtmlElement.php
index 41f2d7e..2c8ab31 100644
--- a/src/Plugin/field_group/FieldGroupFormatter/HtmlElement.php
+++ b/src/Plugin/field_group/FieldGroupFormatter/HtmlElement.php
@@ -69,6 +69,15 @@ class HtmlElement extends FieldGroupFormatterBase {
     if ($this->getSetting('show_label')) {
       $element['#title_element'] = $this->getSetting('label_element');
       $element['#title'] = Html::escape($this->t($this->getLabel()));
+      $element['#title_attributes'] = new Attribute();
+
+      if (!empty($this->getSetting('label_element_classes'))) {
+        $element['#title_attributes']->addClass(explode(' ', $this->getSetting('label_element_classes')));
+      }
+
+      if (!empty($this->getSetting('effect')) && $this->getSetting('effect') !== 'none') {
+        $element['#title_attributes']->addClass('field-group-toggler');
+      }
     }
 
     $form_state = new FormState();
@@ -119,6 +128,18 @@ class HtmlElement extends FieldGroupFormatterBase {
       ),
     );
 
+    $form['label_element_classes'] = array(
+      '#title' => $this->t('Label element HTML classes'),
+      '#type' => 'textfield',
+      '#default_value' => $this->getSetting('label_element_classes'),
+      '#weight' => 3,
+      '#states' => array(
+        'visible' => array(
+          ':input[data-fieldgroup-selector="show_label"]' => array('value' => 1),
+        ),
+      ),
+    );
+
     if ($this->context == 'form') {
       $form['required_fields'] = array(
         '#title' => $this->t('Mark group as required if it contains required fields.'),
@@ -181,6 +202,11 @@ class HtmlElement extends FieldGroupFormatterBase {
       $summary[] = $this->t('Label element: @element',
         array('@element' => $this->getSetting('label_element'))
       );
+      if (!empty($this->getSetting('label_element'))) {
+        $summary[] = $this->t('Label element HTML classes: @label_classes', [
+          '@label_classes' => $this->getSetting('label_element_classes'),
+        ]);
+      }
     }
 
     if ($this->getSetting('attributes')) {
@@ -204,6 +230,7 @@ class HtmlElement extends FieldGroupFormatterBase {
       'element' => 'div',
       'show_label' => 0,
       'label_element' => 'h3',
+      'label_element_classes' => '',
       'effect' => 'none',
       'speed' => 'fast',
       'attributes' => '',
diff --git a/templates/field-group-html-element.html.twig b/templates/field-group-html-element.html.twig
index 73072fc..2b97177 100644
--- a/templates/field-group-html-element.html.twig
+++ b/templates/field-group-html-element.html.twig
@@ -18,7 +18,7 @@
 
 <{{ wrapper_element }} {{ attributes }}>
   {% if title %}
-  <{{ title_element }}{% if collapsible %} class="field-group-toggler"{% endif %}>{{ title }}</{{ title_element }}>
+  <{{ title_element }}{{ title_attributes }}>{{ title }}</{{ title_element }}>
   {% endif %}
   {% if collapsible %}
   <div class="field-group-wrapper">
@@ -27,4 +27,4 @@
   {% if collapsible %}
   </div>
   {% endif %}
-</{{ wrapper_element }}>
\ No newline at end of file
+</{{ wrapper_element }}>
diff --git a/templates/theme.inc b/templates/theme.inc
index 2f0d20a..f5226da 100644
--- a/templates/theme.inc
+++ b/templates/theme.inc
@@ -5,6 +5,8 @@
  * Preprocessors for fieldgroup elements.
  */
 
+use \Drupal\Core\Template\Attribute;
+
 /**
  * Prepares variables for horizontal tabs templates.
  *
@@ -61,7 +63,7 @@ function template_preprocess_field_group_accordion_item(&$variables) {
   }
 
   $variables['open'] = $element['#open'];
-  $variables['label_attributes'] = new \Drupal\Core\Template\Attribute();
+  $variables['label_attributes'] = new Attribute();
   $variables['children'] = (!empty($element['#children'])) ? $element['#children'] : '';
 
 }
@@ -84,6 +86,7 @@ function template_preprocess_field_group_html_element(&$variables) {
   if (!empty($element['#title']) && !empty($element['#title_element'])) {
     $variables['title_element'] = $element['#title_element'];
     $variables['title'] = $element['#title'];
+    $variables['title_attributes'] = $element['#title_attributes'];
   }
 
   $variables['collapsible'] = (!empty($element['#effect']) && $element['#effect'] !== 'none');