textarea.input-lg.area-box-size {
  height: 300px;
  width: 80%;
  outline: none;
  background-color: rgba(4,4,4, 0.8);
  color: white;
  border-color: black;
}

@media (max-width:767px) {
  textarea.input-lg.area-box-size {
    height: 360px;
  }
}