Not sure where the appropriate place to place this is, if not here than kindly let me know where. I just wanted to make an observation. Notepad++ doesn’t recognize ‘flex-direction’ as a valid CSS property.
don’t know if you know that you can define it yourself.
Goto Settings->Style Configurator->CSS->IDENTIFIER and add it to the user defined keywords.
If it is just to inform that it is missing open an issue here.