gistfile1.css

.credit-card {
  padding: 7px 40px 7px 7px;
  background: #FFF url('generic.png') 97% 50% no-repeat;
  background-size: 25px 25px;
  width: 100%;
}

input.visa {
  background-image: url('visa.png');
}

input.mastercard {
  background-image: url('mastercard.png');
}

input.discover {
  background-image: url('discover.png');
}

input.amex {
  background-image: url('amex.png');
}