Improved upload messages

assets/sass/style.sass

@@ -69,13 +69,13 @@ nav
   box-shadow: 0 2px 4px rgba(33,33,33,0.2)
   text-decoration: none
   border-radius: 2px
-  .success
+  &.success
     background: #DCEDC8
     color: #689F38
     border-color: #689F38
     a
       color: #33691E
-  .error
+  &.error
     background: #FFEBEE
     color: #F44336
     border-color: #F44336