login module style update

src/views/login.vue

@@ -71,7 +71,7 @@
                     </div>
                   </div>
                   <div style="padding-bottom:10px;">
-                    <div class="text-center" style="font-weight:bold;margin-top:20px;margin-bottom:10px">
+                    <div class="text-center mt20 mb10">
                       {{ currentUser.userName }}
                     </div>
                     <p class="text-center" style="color:#999;font-size:14px">