var Karte = L.map('Karte').setView([34.724126, -92.4079673], 15);  
         L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
         'attribution':  'Kartendaten &copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> Mitwirkende',
         'useCache': true
         }).addTo(Karte);      

        var bbox = [-95, 30 ,-85, 40];
                var cellSide = 5;
                var options = {units: 'kilometers'};

                var squareGrid = turf.squareGrid(bbox, cellSide, options);
        
        
                L.geoJSON(squareGrid).addTo(Karte);

<script src="https://unpkg.com/@turf/turf@6.5.0/turf.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/papaparse@5.3.0/papaparse.min.js"></script>
<script src="http://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://unpkg.com/leaflet@1.4.0/dist/leaflet.js"></script>
<link href="https://unpkg.com/leaflet@1.4.0/dist/leaflet.css" rel="stylesheet"/>


 <div id='Karte' style='height: 800px; width: 100%;'></div>