body { margin:0; padding:0; }
#map { position:absolute; top:50px; bottom:0; width:100%; } /* Position the map below the file input */

#menu {
    position: absolute;
    background-color: white;
    top: 10px;
    left: 10px;
    z-index: 1;
    padding: 10px;
    border-radius: 3px;
    width: 150px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
#menu h3 {
    margin: 0 0 10px 0;
}
#menu input[type="checkbox"] {
    margin-right: 5px;
}