A base layer of styling can be applied to an area of your site by adding the .ds-base class. If you're implementing the design system on a new site, you'd likely want to apply this class to the <body> element. On existing sites this might not be desirable. In which case, you could apply the .ds-base class to an element which scopes the styling to itself and its children.
Specifically, the base styling sets the following CSS properties:
coloris set to$color-basefont-familyis set to$font-sansfont-sizeis set to$font-size-baseline-heightis set to$font-line-height-base
Modifier: .ds-base--inverse
Applies an inverse text color and background-color