customize admin color scheme with my own colors on multisite

I want to use the same set of colors in admin section (wp-admin) of all sites hosted on a multisite install.

I have added the following code to my child theme:

__( 'My Admin Colors'),
get_template_directory_uri() . '/cssadmin/KPCMS/colors.css',
array( '#8e1e07', '#fff', '#ff9201', '#d3cbae' ),
array( 'base' => '#FF6C1C', 'focus' => '#FFFFFF', 'current' => '#FFFFFF' )

With that, I can select “My Admin Colors” in my profile, but it is not applied.

How should I manage the CSS files, as SASS is involved.

Please tell me how files should be organized in my child theme to get things done.