Description of the limitation and why it is relevant to address
I would like to see that Viktor can be used with theming or at least a dark theme. It will not solve any particular problem but it will make the platform more attractive because even engineers like some styling options
Submitter proposed design (optional)
Maybe the manifest can allow some HTML color schemes. In Flutter you have an option for theming using a specified number of options that loosely follow the names of what this (nice!) website shows;
so maybe the manifest could get options like LIGHT_PRIMARY_COLOR or DARK PRIMARY COLOR etc. and then your frontend engineers might use that in their css or whatever they use to make the tools you create 
Current workarounds
Not that I know of