JSFiddle - React, Tailwind, and code Playground

HTML

<input  placeholder="red" />
<br><br>
<input class="box" placeholder="blue" />

CSS

::-webkit-input-placeholder {
    color: red;
}
:-moz-placeholder {
    color: red;

}
::-moz-placeholder {
    color: red;

}
:-ms-input-placeholder {
    color: red;

}


.box input::-webkit-input-placeholder, .box textarea::-webkit-input-placeholder {
  color: blue;
}
.box input:-moz-placeholder, .box textarea:-moz-placeholder {
  color: blue;
}
.box input:-ms-input-placeholder, .box textarea:-ms-input-placeholder{
  color: blue;
}