JSFiddle - React, Tailwind, and code Playground

HTML

<input id="test" placeholder="Nome, email, etc"><br>
<textarea placeholder="Uma mensagem..."></textarea>

CSS

input,
textarea {
    padding: 10px;
    display: block;
    width: 70%;
}

::-webkit-input-placeholder {
   color: orange;
   font: 12px verdana, arial, sans-serif;
}

:-moz-placeholder {
   color: red;
   font: 12px verdana, arial, sans-serif;
}

::-moz-placeholder {
   color: red;  
   font: 12px verdana, arial, sans-serif;
}

:-ms-input-placeholder {  
   color: red;  
   font: 12px verdana, arial, sans-serif;
}