JSFiddle - React, Tailwind, and code Playground

HTML

<input type='text' name='test' placeholder='colorize placeholder' value='' />

CSS

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

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

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

::placeholder {
    color:red;
}