diff --git a/src/wp-content/themes/twentynineteen/style-editor.css b/src/wp-content/themes/twentynineteen/style-editor.css
index f4e49185fa..d6fcef6769 100644
--- a/src/wp-content/themes/twentynineteen/style-editor.css
+++ b/src/wp-content/themes/twentynineteen/style-editor.css
@@ -654,7 +654,12 @@ body .wp-block.aligncenter {
 }
 
 .wp-block .wp-block {
-  width: initial;
+  width: 100%;
+  height: auto;
+}
+.wp-block-buttons [data-align="left"],
+.wp-block-buttons [data-align="right"] {
+  height: auto;
 }
 
 /** === Base Typography === */