.leaflet-simple-slider {
  z-index:1000;
  width:150px;
  border-radius: 8px;
  height:12px !important;
  background : dimgray;
}

.leaflet-simple-slider-thumb {
  -webkit-appearance: none !important;
  position: absolute;
  top: -4px;
  z-index: 10000 !important;
  height: 20px !important;
  width: 20px !important;
  border-radius: 8px;
  -moz-border-radius: 8px;
  -webkit-border-radius: 8px;
  border: 1px solid dimgray;
  background: rgba(205,201,201,1.0);
}