carbon-components-svelte/docs/src/carbon.scss

@use '@carbon/styles' with (
  $prefix: 'bx',
  $use-flexbox-grid: true
);
@use '@carbon/themes';
@use '@ibm/plex/scss/ibm-plex' with ( $font-prefix: '@ibm/plex');

:root {
  // Emit CSS Custom Properties for the current theme
  @include themes.theme();
}