.tooltip .tooltiptext {
  visibility: hidden;
  width: auto;
  /*background-color: red;*/
  background-color: rgba(0, 0, 0, 0.9);
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px;
  
  /* Position the tooltip */
  width: auto;
  bottom: 100%;
  left: -100px;   
  position: absolute;
  z-index: 1;
}

.tooltip:hover .tooltiptext {
  visibility: visible;
}