form#credit-card label {
  display:inline-block;
  width:150px;
  height:98px;
  background-image:url('carte-credit.jpg');
  background-repeat:no-repeat;
  vertical-align:middle;
}

/* Paypal */
form#credit-card label:nth-child(1) {
  background-position: 0px 0px;
}

/* American Express */
form#credit-card label:nth-child(3) {
  background-position: -150px 0px;
}

/* Visa */
form#credit-card label:nth-child(5) {
  background-position: -150px -98px;
}