JSFiddle - React, Tailwind, and code Playground

HTML

<button id="approve">Approve</button>
<button id="reject">Reject</button>

CSS

button.selected {
    color:#fff;
}
#approve.selected {
    background-color:#24ce3a;
}
#reject.selected {
    background-color:#e32e10;
}

JavaScript

$(document).on('click', 'button', function () {

    if ($(".selected").length === 0 |  $(this).hasClass("selected")) {
        $(this).toggleClass("selected");
    }
});