JSFiddle - React, Tailwind, and code Playground

HTML

<input id="id" />

CSS

.error {
    color:red;
}

JavaScript

$(function () {
    $('#id').on('keyup', function (e) {
        if (!this.value.match(/^\d{0,5}(\.[0-9]{1,2})?$/)) {
            $(this).addClass('error'); // adding error class
        } else {
            $(this).removeClass('error'); // remove error class
        }
    });
});