netbox/netbox/project-static/styles/_dark.scss

// Entry for netbox-dark.css stylesheet.

body[data-netbox-color-mode='dark'] {
  // Imports are scoped under the body when its data-netbox-color-mode attribute is set to 'dark'.
  @import './theme-dark.scss';
  @import './bootstrap.scss';
  @import './select.scss';
  @import './flatpickr-dark.scss';
  @import './netbox.scss';
}