.App{text-align:center;font-family:Arial,sans-serif;padding:20px}.controls{margin-bottom:20px}.controls button{margin:5px;padding:10px 15px;font-size:16px}.controls button.active{background-color:#4caf50;color:#fff}.dimension-controls{margin-top:10px}.dimension-controls label{display:block;margin:10px 0}.legend{display:flex;justify-content:center;flex-wrap:wrap;margin-bottom:20px}.legend-item{display:flex;align-items:center;margin:5px 10px}.legend-color{width:20px;height:20px;margin-right:5px;border:1px solid #ccc}