Issue #2953340 by DuaelFr, WidgetsBurritos, utcwebdev: "Add Block" button is hidden by AdBlock Plus

core/modules/layout_builder/css/layout-builder.css

-.add-section {
+.new-section {
   background-color: #f7f7f7;
   width: 100%;
   outline: 2px dashed #979797;
@@ -8,20 +8,20 @@
   transition: visually-hidden 2s ease-out, height 2s ease-in;
 }
 
-.add-section__link,
-.add-block__link {
+.new-section__link,
+.new-block__link {
   color: #787878;
   border-bottom: none;
   padding-left: 24px;
   background: url(../../../misc/icons/787878/plus.svg) transparent top left / 16px 16px no-repeat;
 }
 
-.add-section__link:hover,
-.add-section__link:active,
-.add-section__link:focus,
-.add-block__link:hover,
-.add-block__link:active,
-.add-block__link:focus {
+.new-section__link:hover,
+.new-section__link:active,
+.new-section__link:focus,
+.new-block__link:hover,
+.new-block__link:active,
+.new-block__link:focus {
   border-bottom-style: none;
   color: #000;
 }
@@ -46,7 +46,7 @@
   outline: 2px dashed #2f91da;
 }
 
-.layout-section .layout-builder--layout__region .add-block {
+.layout-section .layout-builder--layout__region .new-block {
   background-color: #eff6fc;
   padding: 1.5em 0;
   text-align: center;

core/modules/layout_builder/src/Controller/LayoutBuilderController.php

@@ -161,7 +161,7 @@ protected function buildAddSectionLink(SectionStorageInterface $section_storage,
           ],
           [
             'attributes' => [
-              'class' => ['use-ajax', 'add-section__link'],
+              'class' => ['use-ajax', 'new-section__link'],
               'data-dialog-type' => 'dialog',
               'data-dialog-renderer' => 'off_canvas',
             ],
@@ -170,7 +170,7 @@ protected function buildAddSectionLink(SectionStorageInterface $section_storage,
       ],
       '#type' => 'container',
       '#attributes' => [
-        'class' => ['add-section'],
+        'class' => ['new-section'],
       ],
     ];
   }
@@ -226,7 +226,7 @@ protected function buildAdministrativeSection(SectionStorageInterface $section_s
           ],
           [
             'attributes' => [
-              'class' => ['use-ajax', 'add-block__link'],
+              'class' => ['use-ajax', 'new-block__link'],
               'data-dialog-type' => 'dialog',
               'data-dialog-renderer' => 'off_canvas',
             ],
@@ -234,7 +234,7 @@ protected function buildAdministrativeSection(SectionStorageInterface $section_s
         ),
       ];
       $build[$region]['layout_builder_add_block']['#type'] = 'container';
-      $build[$region]['layout_builder_add_block']['#attributes'] = ['class' => ['add-block']];
+      $build[$region]['layout_builder_add_block']['#attributes'] = ['class' => ['new-block']];
       $build[$region]['layout_builder_add_block']['#weight'] = 1000;
       $build[$region]['#attributes']['data-region'] = $region;
       $build[$region]['#attributes']['class'][] = 'layout-builder--layout__region';