If you are not a fan of the current colour, there are ways where you can change them manually. You can achieve this searching for different type of UIs, which some will also change the font of the text inside of TMP (e.g. the font of player names). If searching for one becomes a pain, I will kindly share one which includes Bold text and a Dark UI (Thanks to @Krewlex for sharing first). It's worth mentioning also that this is quite simple to do!
Download this file and unzip it
Head towards the following folder 'C:/ProgramData/TruckersMP/data'
From there, drop the ets2_mod folder you have downloaded into that folder. Please note that you should not rename the folder because it won't work.
If there's any confusion, this is how it should look;
You can also use this to work with American Truck Simulator, simply create of copy of ets2_mod folder onto your desktop, rename it ats_mod and drag it back into that folder. Once you've launched TMP again, you'd have noticed it's worked. I hope this helps!