.wpcf7-not-valid-red {
  color: red !important;
  background: url("../img/cancel.png") 97% no-repeat !important;
  background-size:  auto 70% !important;
}
.wpcf7-not-valid-blue {
  background: url("../img/checked.png") 97% no-repeat !important;
  background-size:  auto 70% !important;
}