JSFiddle - React, Tailwind, and code Playground

HTML

<button id="button">Button</button>
<a href="" class="links">link</a>

CSS

.links {
    color:#FF0000;
}
.links2 {
    color:#0000FF;
}

JavaScript

$('#button').toggle(function () {
    $(".links").addClass("links2");
}, function () {
    $(".links").removeClass("links2");
});