Change terminal tab color in Ubuntu 18.04

I am exactly looking for the same as these guys:

How to make selected tab in terminal more prominent
Customizing terminal tab color in Ubuntu 17.10

They use this file:

~/.config/gtk-3.0/gtk.css

But I can’t find it in my Kubuntu 18.04

Is there any new solution for 18.04 ?

Thanks

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Author: user204415

LUbuntu (L ubuntu) 20.04 screen/display colour calibration how to?

I recently installed LUbuntu 20.04 (UEFI-GPT) dual boot with Win10. (check screenshot attached).

I’m not able to change the color scheme of my display as I can’t find my graphics card control panel program(Intel Graphics Control Panel/AMD Radeon Software) to do so. My screen in more blue in color..and it’s restraining my eye. I’m not getting natural screen color as I used to get in Win10. (blue tint isn’t visible in screenshot)

Prerequisite : I’m noob in Linux world, I appreciate your help and time.

thankyou

System Details

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Author: Barry Barab