/* Tooltip container */
.tooltip {
  position: relative;
}
/* Tooltip text */
.tooltip > .tooltip-text {
  visibility: hidden;
  width: 15em;
  background-color: #9b9b9b;
  color: #fff;
  text-align: center;
  padding: 0.5em;
  /* Position the tooltip text */
  position: absolute;
  z-index: 1;
  bottom: 110%;
  left: 50%;
  margin-left: -8em; /* Use half of the width (120/2 = 60), to center the tooltip */
}
/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover > .tooltip-text {
  visibility: visible;
}
/* arrow at bottom of tooltip text */
.tooltip > .tooltip-text::after {
  content: " ";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #9b9b9b transparent transparent transparent;
}