JSFiddle - React, Tailwind, and code Playground

HTML

<div id="drag">drag</div>

CSS

#drag{
    border: 2px solid #f00;
    width: 100px;
}

JavaScript

$( "#drag" ).draggable({
    drag: function( event, ui ) {
        var body = $('body');
        if(ui.offset.left === 100) body.css('background-color','#00f')
        else if(body.css('background-color')) $('body').css('background-color','') 
        $(this).html(ui.offset.left)
    }
});