var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
osmAttrib = '© <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib}),
map = new L.Map('map', {center: new L.LatLng(40, -100), zoom: 7}),
drawnItems = L.featureGroup().addTo(map);
osm.addTo(map);
.main-itm1 {
display: flex;
flex-direction: column;
width: 360px;
height: 482px;
box-shadow: 0 0 0 rgba(232, 232, 232, 0.11);
border: 1px solid rgba(221, 221, 221, 0.15);
background-color: #ffffff;
text-align: center;
box-sizing: border-box;
justify-content: center;
align-items: center;
}