adjust pbiviz.json

good morning,

i would like to adjust a color of a visual so that it fits the layout of my report.

i opened the code in Visual studio code, tried to adjust a color there but nothing happens

i assume i am missing quite a few steps, can someone show me a step-by-step plan of what needs to be done

to get this done.

i am a beginner in power BI, but i am very curious how to tackle this

thanks in advance

romilied