Edit in JSFiddle 
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Leaflet with Autocomplete API</title>
        
        <link href="https://tiles.locationiq.com/v3/libs/leaflet/1.8.0/leaflet.css" rel="stylesheet" type="text/css"/>
        <script type="text/javascript" src="https://tiles.locationiq.com/v3/libs/leaflet/1.8.0/leaflet.js"></script>
        <script type="text/javascript" src="https://tiles.locationiq.com/v3/js/liq-styles-ctrl-leaflet.js?v=0.1.8"></script>
        
        <style type="text/css">
            body {
                margin: 0;
            }
            #map {
                width: 100vw;
                height: 100vh;
            }
        </style>
    </head>

    <body>
        <div id='map'></div>
        <!-- location control -->
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/leaflet.locatecontrol/dist/L.Control.Locate.min.css" />
        <!-- location control -->
        <script src="https://cdn.jsdelivr.net/npm/leaflet.locatecontrol/dist/L.Control.Locate.min.js"
            charset="utf-8"></script>
        <!-- geocoding plugin -->
        <link rel="stylesheet"
            href="https://tiles.locationiq.com/v3/libs/leaflet-geocoder/1.9.6/leaflet-geocoder-locationiq.min.css">
        <script src="https://tiles.locationiq.com/v3/libs/leaflet-geocoder/1.9.6/leaflet-geocoder-locationiq.min.js"></script>

        <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-plugins/3.0.2/control/Permalink.js"></script>

        <script type="text/javascript">
            // Maps access token goes here
            var key = 'pk.aa7f5d0539c5675b7f3429402939d8fa';

            // Add layers that we need to the map
            var streets = L.tileLayer.Unwired({key: key, scheme: "streets"});

            // Initialize the map
            var map = L.map('map', {
                center: [39.73, -104.99], // Map loads with this location as center
                zoom: 14,
                scrollWheelZoom: true,
                layers: [streets],
                zoomControl: false
            });

            // Add the 'zoom' control
            L.control.zoom({
                position: 'topright'
            }).addTo(map);

            // Add the 'scale' control
            L.control.scale().addTo(map);
            L.control.locate({
                position: "bottomright"
            }).addTo(map);

            // Add the autocomplete text box
            L.control.geocoder(key, {
                // placeholder: 'Search nearby',
                url: "https://api.locationiq.com/v1",
                expanded: true,
                panToPoint: true,
                focus: true,
                position: "topleft"
            }).addTo(map);

            map.addControl(new L.Control.Permalink({ useLocation: true, text: null }));
        </script>
    </body>
</html>