Hello,

1. Add custom variable in _variable.scss file.

check: https://prnt.sc/R6XxtBtTEw2g

File Path: sass/abstract/_variable.scss

2. Add color pallet same variable name.

check: https://prnt.sc/-KDhgUlU7W1Z

File Path: sass/abstract/_maps.scss 

3. Add new color in global.min.js file

check:  https://prnt.sc/B-DeLaPjQawC

File Path: vendor\global\global.min.js

Thanks