tion: absolute;
            top: 0;
            bottom: 0;
            width: 100%;
        }
        
        .switch {
            position: absolute;
            top: 20px;
            left: 20px;
            border-radius: 4px;
            padding: 4px;
            background: #333333;
        }
        
        .item {
            background: #ffffff;
            border-radius: 4px;
            padding: 4px;
            color: #000000;
        }
    </style>
</head>



<body>
    <div id="map_grid"></d