.leaflet-control-defaultextent {

}

.leaflet-control-defaultextent [leaflet-browser-print-pages] { display: none; }

.leaflet-control-defaultextent-toggle {
  text-indent: -9999px;
  white-space: nowrap;
  background-image: url('defaultextent.png');

  font-family: 'FontAwesome';
  top: 0;
  left: 10px;
  content: "\f005";

  width: 26px;
  height: 26px;
  display: block;
}

/* CSS for high-resolution devices */
@media only screen and (-Webkit-min-device-pixel-ratio: 1.5),
only screen and (-moz-min-device-pixel-ratio: 1.5),
only screen and (-o-min-device-pixel-ratio: 3/2),
only screen and (min-device-pixel-ratio: 1.5) {
    .leaflet-control-defaultextent-toggle {
        background-image: url('defaultextent.png');
        background-size: 26px 26px;
        background-repeat: no-repeat;
    }
}