Ticket #56552: #56552.patch

wp-content/themes/twentyeleven/style.css

@@ -2851 +2851 @@
 #ie8 section.featured-post .attachment-small-feature {
         max-width: none;
 }
+
+
+/* Button Block
+----------------------------------------------- */
+
+.wp-block-button.alignright {
+        text-align: right;
+        width: 100%;
+}