Not so long ago, SAP released a suite of applications under the brand "Fiori" - these apps are responsivea, have a uniform look and feel and are much more pleasing to the eye.

Here is an example from the Demokit: https://openui5.hana.ondemand.com/test-resources/sap/m/demok...

This looks really good, but doesn't seem to be part of the open sourced UI? If it is, i can't find it.

It is part of the library - you'll find the Fiori controls under the sap.m (for "mobile") namespace in the API section.

It's the "SplitApp" element that gives you the nice looking, responsive container (I was not able to find a good code sample right away).