Hierarchical Grid hiding custom styling sample - styling partially missing.

[MayaKirova]

Go to: https://staging.infragistics.com/products/ignite-ui-angular/angular/components/hierarchicalgrid/column-hiding#demo
Some of the styling is not applied compared to live: https://infragistics.com/products/ignite-ui-angular/angular/components/hierarchicalgrid/column-hiding#demo