index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Mapping_GeoJSON_Data</title>
    <!-- Leaflet CSS -->
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
        integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
        crossorigin=""/>
    <!-- d3 JavaScript -->
    <script src="https://d3js.org/d3.v5.min.js"></script>      
    <!-- Our CSS -->
    <link rel="stylesheet" type="text/css" href="static/css/style.css">    
</head>
<body>
    <!-- The div that holds our map -->
    <div id="mapid">  
    </div>
     <!-- Make sure you put this AFTER Leaflet's CSS -->
    <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
        integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
        crossorigin="">
    </script>   
    <!-- API key -->
    <script type="text/javascript" src="static/js/config.js"></script>
    <!-- Our JavaScript -->
    <script type="text/javascript" src="static/js/challenge_logic.js"></script>
</body>
</html>