gmrs on "Font Customizer changes fonts in WP editor"

Using the Font Customizer plug in......quite satisfied.
Only issue is that since i am using a dark color scheme site, i need text to be in light color. Site looks great but the WP editor is using the same color. This is a problem since the background of the editor is white, the light grey color is extremely hard to read. Any reason that the site font color is being used in the WP editor? Would really like to have this fixed because having to type blog in MS Word and then copy to site is a pain in the butt! Thank You

https://wordpress.org/plugins/font-customizer/