Design Studio custom CSS in local mode cannot see

Login to DS via BI platform startup. Create a custom CSS file , published to BI platform. If I execute the DS application from BI Launchpad, it shows the output based on Custom CSS file. When I run the same application from DS designer , in local mode, it does not show the expected output of custom CSS file.

Any one has seen this behavior?

And also if i launch the DS application in local mode and design application , how do i publish that to BI platform which i developed in local mode.