CSS code for line and column header colors in Calc in Windows11

A newcomer to forum has a question about the possibility of the writing and lines of the line and column heading colors to change in Calc 7.5.3 via CSS code.
I use the dark-mode and would have the font and lines a little darker .

There is a possibility under Linux, Code:
/ * Lines */
.view: disabled {color: #eeeeeee;}
/ * Numbers/Letters */
.Background {Color: #4d4d4c; }

found in :

Would this possibility also be in Windows11, and if so, in which CSS file I would have to insert this code?
Or is there a different option now?

Thanks from Germany, Nightexpress
Win11, Lo