Brief summary of issue / Description of requested feature:

Background colour of the widgets in the embedded mapper seem to be black which means that some informations
are unreadable as their text colour is also black.

Steps to reproduce the issue / Reasons for adding feature:

1. create a new Script in an empty Profile
2. write createMapper(0,0,600,600) in script and save
3. Result
   

Error output / Expected result of feature

Expected result (Mudlet 4.10.1)

Extra information, such as Mudlet version, operating system and ideas for how to solve / implement:

OS:
Latest PTB (27 Jan)
WIndows 10 and Ubuntu 20.10
Extra informations:
Doesn't seem to affect the mapper if it is in the mapper window (only the embedded mapper is affected)