:-webkit-input-placeholder { /* Chrome */
  color: #ce5fe4;
}
:-ms-input-placeholder { /* IE 10+ */
  color: #ce5fe4;
}
::-moz-placeholder { /* Firefox 19+ */
  color: #ce5fe4;
  opacity: 1;
}
:-moz-placeholder { /* Firefox 4 - 18 */
  color: #ce5fe4;
  opacity: 1;
}

.printCertificate {
    size: 21cm 29.7cm;
    margin: 30mm 45mm 30mm 45mm; /* change the margins as you want them to be. */
}