diff --git a/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php b/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
index 4b704d0..efd917d 100644
--- a/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
+++ b/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
@@ -136,7 +136,11 @@ public function buildRegions(array $build) {
 
         $block_build = [
           '#theme' => 'block',
-          '#attributes' => [],
+          '#attributes' => [
+            'class' => [
+              Html::cleanCssIdentifier('block-plugin-' . $block->getPluginId()),
+            ]
+          ],
           '#weight' => $weight++,
           '#configuration' => $block->getConfiguration(),
           '#plugin_id' => $block->getPluginId(),