How to change ion-radio icon and background, font color?

[davidchan000]

I have been developing a Ionic app.
I am gonna ion-radio in my app.
I worked with ionic demo source, but ion-radio icon is not same to demo.
https://ionicframework.com/docs/components/#radio

My App

And my design

I am a begginer, so I don’t know how to change it.
I want you to help me kindly.
Sincerely