.wcp_white-popup {
  position: relative;
  background: #FFF;
  padding: 30px;
  width: auto;
  max-width: 500px;
  margin: 20px auto;
}

.wcp_white-popup #coupon_code {
    max-width: 330px;
    padding:8px 15px;
}

.wcp_white-popup .mfp-close {
    display:none;
}