title: How to apply css styling on rewards points notification email in opencart 2.0.1.1?
body: <p>When a customer gets rewards points he gets notified by email.
  The default email contains only these lines :</p>
  
  <pre><code>You have received 200 Reward Points!
  
  Your total number of reward points is now 200.
  </code></pre>
  
  <p>I know this text is in language file at</p>
  
  <pre><code>/admin/language/english/mail/customer.php
  $_['text_reward_received']      = 'You have received %s Reward Points!';
   $_['text_reward_total']         = 'Your total number of reward points is now %s.';
  </code></pre>
  
  <p>I need to apply some css styling on this email notification relative to my opencart store. I tried adding html and css in this customer.php language file but it won't work.
  I don't have any idea how can I apply styling i want. Any help?</p>