JSFiddle - React, Tailwind, and code Playground

HTML

<div class="item"></div>

CSS

.item{
    background: #bbb;
    height: 40px;
    width: 40px;
    position: absolute;
    border-radius: 50%;
    left: 0;
    top: 0;
}

JavaScript

$(document).ready(function() {
    var posX, posY, clicked = false;
    function mueve (e) {
        clicked = true;
        posX = e.pageX - 20;
        posY = e.pageY - 20;
        $('.item').animate({left: posX, top: posY});
    }
    $(document).on('mousedown', mueve);
    $(document).on('mouseup', function(e) {
        clicked = false;
    });
    $(document).mousemove(function(e) {
        if (clicked) {
            $('.item').stop(true, true);
            mueve(e);
        }
    });
});