JSFiddle - React, Tailwind, and code Playground

HTML

<input class="gwt-SuggestBox pick-list warningPlaceHolder" id="authorizationNumberSuggestBoxsuggestBox" type="text" maxlength="30" placeholder="This Field is Required">

CSS

.warningPlaceHolder::-webkit-input-placeholder {
    color: red;
}
.warningPlaceHolder:-moz-placeholder {
    color: red;
}
.warningPlaceHolder::-moz-placeholder {
    color: red;
}
.warningPlaceHolder:-ms-input-placeholder {
    color: red;
}