JSFiddle - React, Tailwind, and code Playground

HTML

<div id="feira"> 
</div>
<button>Organizar</button>

CSS

#feira{
    position: absolute;
    right: 0px;
    bottom: 0px;
    width: 150px;
    border:3px solid #73AD21;
    padding: 10px;
}

.barraca {
   display: inline-block;
   background-color: #AAA;
   position: relative;
   width: 100px;
   height: 150px;
   right: 0px;
   border: 3px solid #73AD21;
   margin-left: 5px;
}

JavaScript

$(document).ready(function() {
	$("button").click(function() {
		var aumentarLargura = $("#feira").width();
		aumentarLargura += $(".barraca").width() + 10;
		$("#feira").width(aumentarLargura + "px");
		$("#feira").append("<div class=\"barraca\"></div>");
	});
});