JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <input type="text" />
</div>

CSS

.parent {
    height:100px;
    width:200px;
    border:2px solid red;
}
.parent.active {
    border:2px solid #FF0;
}

JavaScript

$('input').on('focus', function () {
    $(this).parent().addClass('active');
});