textarea:-moz-placeholder,
textarea.ref {
  -moz-appearance: none;
  color: black;
  background-color: green;
}

textarea:-moz-placeholder.complex,
textarea.complex-ref {
  -moz-appearance: none;
  color: green;
  background-color: #c7c7c7;
  font-style: italic;
  border: 2px solid green;
  height: 300px;
  width: 300px;
}