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✅ Final Template Code

index.html
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<!DOCTYPE html>
<html>
    <head>
        <title>Basic Leaflet Map</title>
        <meta charset="utf-8" />
        <link rel="shortcut icon" href="#">
        <link rel="stylesheet" href="styles/style.css">

        <!-- Leaflet's css-->
        <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />

        <!-- Leaflet's JavaScript-->
        <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
    </head>

    <body>
        <div class="main">
            <div id="contents">
                <!-- hint: the majority of lab 1 assignment can go here -->
            </div>
            <div id="the_map"></div>
        </div>
    </body>
    <script src="js/init.js"></script>
</html>
styles/style.css
body{
    display: grid;
    /* grid-template-columns: 1fr;  */
    grid-auto-rows: auto 1fr;
    grid-template-areas: "header" "main_content" "footer";
    background-color: aqua;
    /* height: 100vh; */
}

header{
    grid-area: header;
}

#footer{
    grid-area: footer;
}

.main{
    grid-area: main_content;
    grid-template-areas: "content" "main_map";
    display: grid;
}

#contents{
    grid-area: content;
}

#the_map{
    height:80vh;
    grid-area: main_map;
}
js/init.js
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// use the variables
const map = L.map('the_map').setView([34.0709,-118.444], 5);

L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

// create a function to add markers
function addMarker(lat,lng,title,message){
    console.log(message)
    L.marker([lat,lng]).addTo(map).bindPopup(`<h2>${title}</h2> <h3>${message}</h3>`)
    return message
}

// use our marker functions
addMarker(37,-122,'home','home land!')
addMarker(32,-118,'work','where i work land!')
addMarker(39,-119,'location 1','random location')
addMarker(36,-120,'location 2','another random location')

Now you should be ready to take on the lab assignment!