diff --git a/src/wp-content/themes/twentynineteen/style-editor.scss b/src/wp-content/themes/twentynineteen/style-editor.scss
index 2c129c809a..50a7b0c679 100644
--- a/src/wp-content/themes/twentynineteen/style-editor.scss
+++ b/src/wp-content/themes/twentynineteen/style-editor.scss
@@ -1020,3 +1020,13 @@ $group-block-background__padding: $font__size_base;
 		width: 100%;
 	}
 }
+
+/* Post Author Block  */ 
+.editor-styles-wrapper {
+
+	& .avatar,
+	& .wp-block-post-author__avatar img {
+	  border-radius: 50%;
+	}
+	
+}
\ No newline at end of file