paypal-checkout.html

<div>
  <style>.paypal-button-widget { display: none !important; }</style>
  <div id="t1">
    <!-- style this however you want -->
    <a href ng-click="initPaypal()"
      ng-style="{ opacity: showButton ? '1' : '0.5' }">
      <img src="https://www.paypal.com/en_US/i/btn/btn_xpressCheckout.gif" alt="PayPal">
    </a>
  </div>
</div>