Scroll issue on Socially tutorial in Angular-Meteor with Ionic

when i follow angular-meteor tutotial’s socially app,
i could do everything before ‘step22-ionic’.
but, during proceed step22, socially app didn’t to scroll partiesList page.
i could found the problem when i proceed step by step.
the problem is step22.5(import ionic styles)
after imported ionic.css into socially.js, partiesList couldn’t scrolling.
how can i fix it?