change placeholder text color of textarea

Wrap in quotes:

onchange="{(e) => this.props.handleUpdateQuestion(e, firstQuestion.Id)}"

otherwise, it should work just fine:

textarea::-webkit-input-placeholder {
  color: #0bf;
}

textarea:-moz-placeholder { /* Firefox 18- */
  color: #0bf;  
}

textarea::-moz-placeholder {  /* Firefox 19+ */
  color: #0bf;  
}

textarea:-ms-input-placeholder {
  color: #0bf;  
}

textarea::placeholder {
  color: #0bf;  
}
<textarea placeholder="test"></textarea>

I am not sure but I think is not necessary to use the prefixes right now.

textarea::placeholder {
  color: #fff;  
}

Tags:

Html

Css