Twenty Twelve: Fixes navigation block submenus being cut off.

The navigation block submenus were being cut off. This is the simpler method proposed in patches.

Props poena, sabernhardt.
Fixes #61672.


git-svn-id: https://develop.svn.wordpress.org/trunk@58887 602fd350-edb4-49c9-b593-d223f7449a82

Author: karmatosed

src/wp-content/themes/twentytwelve/css/blocks.css

@@ -340,6 +340,12 @@ pre.wp-block-code {
 	margin-bottom: 0;
 }
 
+/* Navigation */
+
+.site-content .wp-block-navigation {
+	overflow: visible;
+}
+
 /*--------------------------------------------------------------
 5.0 Blocks - Widgets
 --------------------------------------------------------------*/