fix username navbar text in fluid example for responsive variations

docs/examples/fluid.html

@@ -17,6 +17,15 @@
       .sidebar-nav {
         padding: 9px 0;
       }
+
+      @media (max-width: 980px) {
+        /* Enable use of floated navbar text */
+        .navbar-text.pull-right {
+          float: none;
+          padding-left: 5px;
+          padding-right: 5px;
+        }
+      }
     </style>
     <link href="../assets/css/bootstrap-responsive.css" rel="stylesheet">