How to apply custom color scheme for xfce mousepad

How to apply custom style for Mousepad 0.5.10 in Debian 12? I created a copy of classic.xml and modified the content of the copy as you can see below. But if I run Mousepad, then the new color-scheme is not listed within preferences > view > color scheme. $ ls -l /usr/share/gtksourceview-3.0/styles total 80 -rw-r--r-- 1 root root 5304 14. Sep 2019 classic.xml -rw-r--r-- 1 root root 7332 14. Sep 2019 cobalt.xml -rw-r--r-- 1 root root 8637 14. Sep 2019 kate.xml -rw-r--r-- 1 root root 5310 8. Apr 19:16 my_classic.xml -rw-r--r-- 1 root root 6498 14. Sep 2019 oblivion.xml -rw-r--r-- 1 root root 4340 14. Sep 2019 solarized-dark.xml -rw-r--r-- 1 root root 4265 14. Sep 2019 solarized-light.xml -rw-r--r-- 1 root root 3441 14. Sep 2019 styles.rng -rw-r--r-- 1 root root 6214 14. Sep 2019 tango.xml $ sudo nano /usr/share/gtksourceview-3.0/styles/my_classic.xml GtkSourceView team Classic color scheme