Paper

Encapsulate some UI to set it apart visually.

The Paper's default background is the same as the body's default background, aka --mantine-color-body.

• In light mode, it is white #FFF.
• In dark mode, it is dark.7.

As such, we may have to override's Paper background with bg.

Paper also adds a radius (theme.defaultRadius) which defaults to 8px.

customizations

• Add a pre-styled border with withBorder (boolean)
• Add a pre-styled shadow with shadow. We specify an alias (e.g. sm), or a CSS box-shadow literal.