Undefined mixin `box-sizing`

[arthurshlain]

What i doing wrong? I add bourbon files to flipclock.scss file location, but then have error:

Error: Undefined mixin 'box-sizing'. on line 9 of flipclock.scss, in `box-sizing' from line 9 of flipclock.scss

Search 'box-sizing' occurrence in Bourbon files found nothing.

[arthurshlain]

Deprecation Warning: This mixin has been deprecated and will be removed in v5.0. https://www.bourbon.io/docs/4/