.leaflet-control-layers-group-name {
  font-weight: bold;
  margin-bottom: .1em;
  display: block;
  font-size: 10px;
  overflow-y: auto;
}

.leaflet-control-layers-group {
  margin-bottom: .1em;
  overflow-y: auto;
}

.leaflet-control-layers-group label {
  padding-left: .1em;
  overflow-y: auto;
}