diff --git a/core/modules/block/css/block.admin.css b/core/modules/block/css/block.admin.css
index edee308..1fa1d12 100644
--- a/core/modules/block/css/block.admin.css
+++ b/core/modules/block/css/block.admin.css
@@ -43,15 +43,6 @@ a.block-demo-backlink:hover {
 .block-list-secondary .form-type-search {
   padding: 0 1em;
 }
-#block-placed {
-  background-color: #ffd;
-}
-#edit-settings-admin-label label {
-  display: inline;
-}
-#edit-settings-admin-label label:after {
-  content: ':';
-}
 
 /* Wide screens */
 @media
diff --git a/core/modules/block/js/block.admin.js b/core/modules/block/js/block.admin.js
index 422a83a..573f486 100644
--- a/core/modules/block/js/block.admin.js
+++ b/core/modules/block/js/block.admin.js
@@ -79,7 +79,7 @@
           // Just scrolling the document.body will not work in Firefox. The html
           // element is needed as well.
           $('html, body').animate({
-            scrollTop: $('#block-placed').offset().top - $container.offset().top + $container.scrollTop()
+            scrollTop: $('.js-block-placed').offset().top - $container.offset().top + $container.scrollTop()
           }, 500);
         });
       }
diff --git a/core/modules/block/src/BlockListBuilder.php b/core/modules/block/src/BlockListBuilder.php
index 293f088..7d1d477 100644
--- a/core/modules/block/src/BlockListBuilder.php
+++ b/core/modules/block/src/BlockListBuilder.php
@@ -247,7 +247,11 @@ public function buildForm(array $form, FormStateInterface $form_state) {
             ),
           );
           if ($placement && $placement == Html::getClass($entity_id)) {
-            $form['blocks'][$entity_id]['#attributes']['id'] = 'block-placed';
+            $form['blocks'][$entity_id] = array(
+              '#attributes' => array (
+                'class' => array('color-warning', 'js-block-placed')
+              )
+            );
           }
 
           $form['blocks'][$entity_id]['info'] = array(
diff --git a/core/modules/system/templates/form-element-label.html.twig b/core/modules/system/templates/form-element-label.html.twig
index 6ececd9..bec08b9 100644
--- a/core/modules/system/templates/form-element-label.html.twig
+++ b/core/modules/system/templates/form-element-label.html.twig
@@ -22,5 +22,5 @@
   ]
 %}
 {% if title is not empty or required -%}
-  <label{{ attributes.addClass(classes) }}>{{ title }}</label>
+  <strong{{ attributes.addClass(classes) }}>{{ title }}: </strong>
 {%- endif %}