Resolve "Add payment processing UI"

Closes #3 (closed)

aleksis/apps/tezor/templates/tezor/invoice/full.html

@@ -11,7 +11,7 @@
     <a class="btn colour-primary waves-effect waves-light" href="{% url 'invoice_group_by_pk' object.group.pk %}">{% trans "Back" %}</a>
 
     <div class="row">
-      <div class="col s6">
+      <div class="col s12 m6">
         <div class="card">
           <div class="card-content">
             <span class="card-title">{% trans "Billing information" %}</span>
@@ -43,7 +43,7 @@
           </div>
         </div>
       </div>
-      <div class="col s6">
+      <div class="col s12 m6">
         <div class="card">
           <div class="card-content">
             <span class="card-title">{% trans "Payment" %}</span>