diff --git a/core/modules/layout_builder/css/layout-builder.css b/core/modules/layout_builder/css/layout-builder.css
index 2f07a95..0b61756 100644
--- a/core/modules/layout_builder/css/layout-builder.css
+++ b/core/modules/layout_builder/css/layout-builder.css
@@ -86,7 +86,7 @@
   padding-top: 0.55em;
 }

-#drupal-off-canvas a.inline-block-create-button {
+#drupal-off-canvas .choose-block-container .inline-block-create-button {
   display: block;
   padding: 24px;
   padding-left: 44px;
@@ -95,15 +95,14 @@
   background: url(../../../misc/icons/bebebe/plus.svg) transparent 16px no-repeat;
 }

-#drupal-off-canvas a.inline-block-create-button,
-#drupal-off-canvas .inline-block-list a {
+#drupal-off-canvas .choose-block-container .inline-block-create-button,
+#drupal-off-canvas .inline-block-list .inline-block-list__item {
   margin: 0 -20px;
-  transition: background-color 0.5s;
   background-color: #444;
 }

-#drupal-off-canvas a.inline-block-create-button:hover,
-#drupal-off-canvas .inline-block-list a:hover {
+#drupal-off-canvas .choose-block-container .inline-block-create-button:hover,
+#drupal-off-canvas .inline-block-list .inline-block-list__item:hover {
   background-color: #333;
 }

@@ -111,7 +110,7 @@
   margin-bottom: 15px;
 }

-#drupal-off-canvas .inline-block-list a {
+#drupal-off-canvas .inline-block-list .inline-block-list__item {
   display: block;
   padding: 15px 0 15px 25px;
 }
diff --git a/core/modules/layout_builder/src/Controller/ChooseBlockController.php b/core/modules/layout_builder/src/Controller/ChooseBlockController.php
index 6c94732..7e6c1ba 100644
--- a/core/modules/layout_builder/src/Controller/ChooseBlockController.php
+++ b/core/modules/layout_builder/src/Controller/ChooseBlockController.php
@@ -75,6 +75,9 @@ public static function create(ContainerInterface $container) {
    */
   public function build(SectionStorageInterface $section_storage, $delta, $region) {
     $build['#title'] = $this->t('Choose a block');
+    $build['#type'] = 'container';
+    $build['#attributes']['class'][] = 'choose-block-container';
+
     if ($this->entityTypeManager->hasDefinition('block_content_type') && $types = $this->entityTypeManager->getStorage('block_content_type')->loadMultiple()) {
       if (count($types) === 1) {
         $type = reset($types);
@@ -203,6 +206,7 @@ protected function getBlockLinks(SectionStorageInterface $section_storage, $delt
         ),
         'attributes' => $this->getAjaxAttributes(),
       ];
+      $link['attributes']['class'][] = 'inline-block-list__item';

       $links[] = $link;
     }