Have thermal comfort overlay show normal or tolerable areas in green

[The Plum Gate]

The thermal comfort overlay is rather plain - every navigable area is either hot or cold, but the grey is rather dull and despite rocks and tiles being extremely hot, these still show up as grey or black. Some other color might have a more appreciable contrast for differentiating normal temperatures where the duplicants won't complain about their temperature or thermal comfort. 

This may be especially useful for determining thresholds.

Edit to title

[Botaxalim]

They do have temperature with green, thermal however need more colour, grey is too bland in my taste

[Michi01]

This might be because I'm color blind but the red and grey also look a bit too similar imo (it's not that I can't differentiate them at all, but they look much more similar than the blue from cold areas does compared to both).