Change the font size of notification message

Hi

I am using the vaadin runo theme.
I would like to reduce the font size of the notification message.

viewLayout.getWindow().showNotification(message,Window.Notification.TYPE_ERROR_MESSAGE);

I tried playing around in my css

.v-Notification h2,
.v-Notification p,
.v-Notification-error h2,
.v-Notification-error p,
.v-Notification-warning h2,
.v-Notification-warning p {
display: inline;
margin: 0 0.5em 0 0;
font-size: 10px;
}

But it doesnt seem to work.

I think it's h1 instead of h2.