body{font-family:Arial,sans-serif;margin:0;padding:20px;background-color:#f7f9fc}.container{max-width:800px;margin:0 auto;background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 10px #0000001a}h1,h2{text-align:center;color:#333}.chart-container{position:relative;height:250px;margin-bottom:30px}.instructions{text-align:center;margin:10px 0 20px;font-size:14px;color:#666}#contextMenu{display:none;position:absolute;background-color:#fff;border:1px solid #ccc;box-shadow:0 2px 5px #0003;padding:5px 0;z-index:1000}#contextMenu div{padding:5px 15px;cursor:pointer}#contextMenu div:hover{background-color:#f2f2f2}