.leaflet-control-better-filelayer {
    background-color: #fafafa;
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-radius: 2px;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' width=\'24\' height=\'24\' viewBox=\'0 0 24 24\'><path fill=\'none\' d=\'M0 0h24v24H0z\'/><path d=\'M12 2l-8 8h5v8h6v-8h5z\'/></svg>');
    background-position: center;
    background-repeat: no-repeat;
    width: 30px;
    height: 30px;
    cursor: pointer;
}

.leaflet-control-better-filelayer input[type="file"] {
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}