diff --git a/src/wp-includes/css/wp-embed-template.css b/src/wp-includes/css/wp-embed-template.css
index 6118ab4d2b6d1..c72f7358aa41f 100644
--- a/src/wp-includes/css/wp-embed-template.css
+++ b/src/wp-includes/css/wp-embed-template.css
@@ -314,6 +314,11 @@ p.wp-embed-share-description {
 	cursor: text;
 }
 
+.wp-block-embed__wrapper iframe[src*="youtube.com/shorts"] {
+    aspect-ratio: 9 / 16;
+    height: auto;
+}
+
 textarea.wp-embed-share-input {
 	height: 72px;
 }