Index: wp-content/themes/twentytwelve/style.css
===================================================================
--- wp-content/themes/twentytwelve/style.css	(revision 21437)
+++ wp-content/themes/twentytwelve/style.css	(working copy)
@@ -1320,7 +1320,16 @@
 	line-height: 1.846153846;
 }
 
+/* Twitter Widget */
+.widget_twitter li {
+	list-style-type: none;
+}
+.widget_twitter .timesince {
+	display: block;
+	text-align: right;
+}
 
+
 /* =Media queries
 -------------------------------------------------------------- */