Figure out the CSS for the Adobe XD plugin

The Bulma CSS is based on Flex box and XD does not support all the tags of the Flex, thus the poor rendering of the elements.

Figure out if Grid layout works

Grid is not supported.

Decide on which CSS framework to use.

There is no official CSS suggestion from Xd devs. Unfortunately spectrum is also not implemented completely. A fork of spectrum components work on XD and this has a downside of diverging from the main spectrum implementation.

Develop own CSS eliminating unsupported tags.

Its better to use the default styling and use Flex box to layout the items.