.leaflet-popup-content-wrapper,
.leaflet-popup-tip
{
background: yellow;
}
.w-popup .leaflet-popup-content-wrapper {
  background-color: #ffffe6;
  border: 5px solid #000000;
  color: #333;
  border-radius: 10px;
}
.w-popup .leaflet-popup-tip {
  background-color: #b3b3cc;
}