::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  color: darkgrey;
}

::-moz-placeholder { /* Firefox 19+ */
  color: darkgrey;
}

:-ms-input-placeholder { /* IE 10+ */
  color: darkgrey;
}

:-moz-placeholder { /* Firefox 18- */
  color: darkgrey;
}

input#postal_code[readonly], input#locality[readonly] {
  background: #bfbfbf;
}