JSFiddle - React, Tailwind, and code Playground

HTML

<span class="taPicker" data-imgID="0">0</span>
<span class="taPicker" data-imgID="1">1</span>
<span class="taPicker" data-imgID="2">2</span>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

CSS

span.taPicker {
  color: black;
}

JavaScript

var selectedClass = null;
$(".taPicker").click(function(e) {
    var imgID = $(this).attr("data-imgID");
    $('body').addClass('picker-' + imgID);
    if (selectedClass != null) {
        $('body').removeClass(selectedClass);
    }
    selectedClass = 'picker-' + imgID;
});