How do we make the Dublin theme's Message Notification bar smaller, something more like the London theme? It intrudes too much into the UI at the moment, blocking some menu items.
You need to override the Feedback_Message CSS classes from the Dublin Theme.
The Dublin Theme stylesheet has a section with all the CSS classes and properties that define the look and feel of the Feedback Message, as shown below.
Just copy the classes that you want to your eSpace. Then, change the properties as needed.