prettifying payment cancel

mkt/inapp_pay/templates/inapp_pay/payment_cancel.html

@@ -1,8 +1,14 @@
 {% extends "inapp_pay/base.html" %}
 
 {% block screen_content %}
-<section class="paypal-parent paypal-thank-you">
+<header>
+  {{ _('Marketplace') }}
+</header>
+<div>
   <h2>{{ loc('Payment canceled') }}</h2>
   <p>{{ loc('Close this window to continue.') }}</p>
-</section>
+</div>
+<footer>
+    <a class="button close" href="#">{{ loc('Close window') }}</a>
+</footer>
 {% endblock %}