gistfile1.css

/* 
  Older email clients and (some) webmail clients (Gmail!) will apply 
  this rule. Some clients (like older Lotus Notes) don't 
  support background-color on links, so I didn't want white
  links on a white background.
*/
a.button {
  background-color: #FFFFFF;
  color: #d9286b;
}

/* 
  Target email clients that support CSS3!
  Includes Apple Mail, Mac Outlook, Thunderbird, plus
  iOS, Android and Windows Phone native email clients.
*/
a.button:nth-of-type(1n) {
  background-color: #cf1c5a;
  color: #ffffff;
}