# layout.breakpoints.narrow

Part of [Layout](https://kernstra.com/docs/web-sdk/config/layout) in the Kernstra Web SDK 1.0.0 configuration reference.

- Type: `number`
- Default: `640`
- Page: https://kernstra.com/docs/web-sdk/config/layout/breakpoints-narrow

The container width at and below which the viewer is `narrow`.

Web page: https://kernstra.com/docs/web-sdk/config/layout/breakpoints-narrow