diff --git a/core/misc/vertical-tabs.js b/core/misc/vertical-tabs.js
index f8c20ed..6d902e9 100644
--- a/core/misc/vertical-tabs.js
+++ b/core/misc/vertical-tabs.js
@@ -45,6 +45,7 @@ Drupal.behaviors.verticalTabs = {
         tab_list.append(vertical_tab.item);
         $this
           .removeClass('collapsible collapsed')
+          .attr('open', true)
           .addClass('vertical-tabs-pane')
           .data('verticalTab', vertical_tab);
         if (this.id === focusID) {
diff --git a/core/modules/views/views_ui/css/views-admin-rtl.css b/core/modules/views/views_ui/css/views-admin-rtl.css
index 67b803a..b4039a3 100644
--- a/core/modules/views/views_ui/css/views-admin-rtl.css
+++ b/core/modules/views/views_ui/css/views-admin-rtl.css
@@ -53,11 +53,6 @@
   left: auto;
 }
 
-.views-display-columns details summary {
-  padding-left: inherit;
-  padding-right: 0;
-}
-
 /* @end */
 
 /* @group Attachment configuration columns */
diff --git a/core/modules/views/views_ui/css/views-admin.css b/core/modules/views/views_ui/css/views-admin.css
index ad2778d..5bca0b8 100644
--- a/core/modules/views/views_ui/css/views-admin.css
+++ b/core/modules/views/views_ui/css/views-admin.css
@@ -184,29 +184,12 @@
 
 /* @group Attachment collapsible details */
 
-.views-display-tab summary {
-  position: relative;
-}
-
-.views-display-tab .details-wrapper {
-  position: relative;
-}
-
 .views-display-columns details {
   border: none;
   margin: 0;
   padding: 0;
 }
 
-.views-display-columns details summary {
-  padding-left: 0; /* LTR */
-}
-
-.views-display-columns summary {
-  margin-top: 0;
-  padding: 6px 0;
-}
-
 .views-display-columns .details-wrapper {
   padding: 0;
 }
diff --git a/core/modules/views/views_ui/css/views-admin.theme.css b/core/modules/views/views_ui/css/views-admin.theme.css
index a4da8f8..e7f9255 100644
--- a/core/modules/views/views_ui/css/views-admin.theme.css
+++ b/core/modules/views/views_ui/css/views-admin.theme.css
@@ -570,10 +570,6 @@ ul#views-display-menu-tabs li.add ul.action-list li{
    margin-top: 0;
  }
 
-.views-display-column details.collapsible summary {
-  font-size: 13px;
-}
-
  /* @end */
 
 /* @group Auto preview
@@ -591,7 +587,7 @@ ul#views-display-menu-tabs li.add ul.action-list li{
   margin-left: 2px;
 }
 
-#views-ui-preview-form .form-type-textfield {
+#views-ui-preview-form .form-type-textfield, #views-ui-preview-form .form-actions {
   margin-top: 5px;
 }
 
diff --git a/core/themes/seven/style.css b/core/themes/seven/style.css
index 0d20936..c46742c 100644
--- a/core/themes/seven/style.css
+++ b/core/themes/seven/style.css
@@ -1024,10 +1024,6 @@ div.add-or-remove-shortcuts {
 
 /* @group Forms */
 
-details details {
-  border: medium none;
-}
-
 /**
  * Seven positions the summary absolutely, but does not have a way to ignore
  * details without a summary so we make one up.