How to make a gadget wallboard capable?

[Danut M _StonikByte_]

I am developing a gadget plugin for Jira Server. I have a gadget that is properly displayed on a Jira dashboard. But when switching to wallboard mode, it is not properly displayed, some texts and lines not being visible. 

What should I do to make this gadget wallboard compatible?

Dashboard:

Wallboard:

Thank you!