Ionic CSS Components Styling Not Working

ionic-v1
1

I’m just copying the HTML code of ionic components into my App, but it is not styling like original sample.

image
cards.jpg981×397 132 KB 

<ion-view view-title="About us">
  <ion-content padding>
    <h1>About us</h1>
    <ion-card>
       <ion-card-header>
         Header
       </ion-card-header>
       <ion-card-content>
          The British use the term "header", but the American term "head-shot" the English simply refuse to adopt.
       </ion-card-content>
    </ion-card>    
  </ion-content>
</ion-view>

but it returns me this
image

I’ve checked all css and js is working on page, except ionic components.