Twenty Fifteen: prevent too-wide tables from popping out of posts.

Props iamtakashi, fixes #30420


Built from https://develop.svn.wordpress.org/trunk@30566


git-svn-id: http://core.svn.wordpress.org/trunk@30555 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentyfifteen/style.css

@@ -406,6 +406,7 @@ table {
 	border-spacing: 0;
 	border-width: 1px 0 0 1px;
 	margin: 0 0 1.6em;
+	table-layout: fixed; /* Prevents HTML tables from becoming too wide */
 	width: 100%;
 }