.leaflet-control-option-dialog a {
    background:#fff url(gear.png) no-repeat 0 0;
    background-size:26px 26px;
}
.leaflet-touch .leaflet-control-option-dialog a {
    background-position: 2px 2px;
}


.leaflet-control-jump-button a {
    background:#fff url(jump.png) no-repeat 0 0;
    background-size:22px 22px;
}
.leaflet-touch .leaflet-control-jump-button a {
    background-position: 4px 4px;
}