How to use styleUrls in ionic2

I want to use styleUrls tag in @Component ,please help me.

Your system information:

Cordova CLI: 6.5.0
Ionic Framework Version: 2.2.0
Ionic CLI Version: 2.2.1
Ionic App Lib Version: 2.2.0
Ionic App Scripts Version: 1.1.4
ios-deploy version: 1.9.1
ios-sim version: 5.0.13
OS: macOS Sierra
Node Version: v7.6.0
Xcode version: Xcode 8.2.1 Build version 8C1002