.ol-tooltip {
  display: none;
  position: absolute;
  background-color: white;
  -moz-box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  -webkit-filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
  filter: drop-shadow(0 1px 4px rgba(0,0,0,0.2));
  padding: 15px;
  border-radius: 10px;
  border: 1px solid #cccccc;
  bottom: 5px;
  left: -50px;
}
#tooltip-content {
  white-space: nowrap;
}