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✅ Final Template Code

index.html
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<!DOCTYPE html>
<html>
    <head>
        <title>Hello World</title>
        <!-- hint: remember to change your page 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>
        <header>
            <!-- space for a menu -->
        </header>

        <div class="main">
            <div id="contents">
                <!-- page contents can go here -->
                <iframe src="https://docs.google.com/forms/d/e/1FAIpQLSdqVT10bEbUrULMu6Etwj4ZBXGf-LAxcKohAINFbIdZmHS6OA/viewform?embedded=true" width="640" height="654" frameborder="0" marginheight="0" marginwidth="0">Loading…</iframe>
            </div>
            <div id="the_map"></div>
        </div>
        <div id="footer">
            Copyright(2022)
        </div>
        <script src="js/init.js"></script>
    </body>
</html>
js/init.js
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// declare variables
let mapOptions = {'center': [34.0709,-118.444],'zoom':5}

// use the variables
const map = L.map('the_map').setView(mapOptions.center, mapOptions.zoom);

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
}

const dataUrl = "https://docs.google.com/spreadsheets/d/e/2PACX-1vSpOaH94y-oguAqbtcvZRyKdrEYiT1JOzW0jmmreznYS8THdQTYQ6cUB7J_68SZLgjpXbB_FY_nDf2A/pub?output=csv"

function loadData(url){
    fetch(url)
        .then(response => {
            console.log(response)
            return response
        })
        .then(data =>{
            // do something with the data
        })
}
// we will put this comment to remember to call our function later!
loadData(dataUrl)
styles/style.css
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body{
    display: grid;
    grid-auto-rows: auto 1fr;
    grid-template-areas: "header" "main_content" "footer";
    background-color: aqua;
}

header{
    grid-area: header;
}

#footer{
    grid-area: footer;
}

.main{
    grid-area: main_content;
    grid-template-columns: 1fr 1fr;
    grid-template-areas: "main_map content";
    display: grid;
}

#contents{
    grid-area: content;
}

#the_map{
    height:80vh;
    grid-area: main_map;
}