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Add a GeoJSON polygon

Style a polygon with the fill layer type.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Add a GeoJSON polygon</title>
    <meta property="og:description" content="Style a polygon with the fill layer type." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@4.4.1/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/maplibre-gl@4.4.1/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const map = new maplibregl.Map({
        container: 'map',
        style:
            'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: [-68.13734351262877, 45.137451890638886],
        zoom: 5
    });

    map.on('load', () => {
        map.addSource('maine', {
            'type': 'geojson',
            'data': {
                'type': 'Feature',
                'geometry': {
                    'type': 'Polygon',
                    'coordinates': [
                        [
                            [-67.13734351262877, 45.137451890638886],
                            [-66.96466, 44.8097],
                            [-68.03252, 44.3252],
                            [-69.06, 43.98],
                            [-70.11617, 43.68405],
                            [-70.64573401557249, 43.090083319667144],
                            [-70.75102474636725, 43.08003225358635],
                            [-70.79761105007827, 43.21973948828747],
                            [-70.98176001655037, 43.36789581966826],
                            [-70.94416541205806, 43.46633942318431],
                            [-71.08482, 45.3052400000002],
                            [-70.6600225491012, 45.46022288673396],
                            [-70.30495378282376, 45.914794623389355],
                            [-70.00014034695016, 46.69317088478567],
                            [-69.23708614772835, 47.44777598732787],
                            [-68.90478084987546, 47.184794623394396],
                            [-68.23430497910454, 47.35462921812177],
                            [-67.79035274928509, 47.066248887716995],
                            [-67.79141211614706, 45.702585354182816],
                            [-67.13734351262877, 45.137451890638886]
                        ]
                    ]
                }
            }
        });
        map.addLayer({
            'id': 'maine',
            'type': 'fill',
            'source': 'maine',
            'layout': {},
            'paint': {
                'fill-color': '#088',
                'fill-opacity': 0.8
            }
        });
    });
</script>
</body>
</html>