body {
            font-family: sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        #game-container {
            display: flex;
            gap: 50px;
            margin-top: 20px;
        }

        .column {
            padding: 10px;
            min-width: 150px;
        }

        .item {
            padding: 5px;
            margin: 5px 0;
            cursor: pointer;
            width: max-content;
            border: 1px solid transparent;
        }

        .item.selected {
            background-color: lightblue;
        }

        #canvas-container {
            position: relative;
            width: 100%;
            height: 500px;
            margin-top: 20px;
        }

        canvas {
            position: absolute;
            top: 0;
            left: 0;
            width: 90%;
            height: 90%;
            z-index: -1;
        }

        #message {
            margin-top: 20px;
            font-weight: bold;
            color: green;
            border: 1px solid black;
        }

        button {
            margin-top: 10px;
            padding: 10px 15px;
            cursor: pointer;
        }