Ionic CSS Components Styling Not Working

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

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

but it returns me this

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