a.anchor {
    display: block;
    position: relative;
    top: -50px;
    visibility: hidden;
}

.vertical-center {
  margin: 10px;
  position: relative;
  top: 100%;
  -ms-transform: translateY(50%);
  transform: translateY(50%);
}

.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black; /* If you want dots under the hoverable text */
}

/* Tooltip text */
.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  background-color: black;
  color: #fff;
  text-align: center;
  padding: 5px 0;
  border-radius: 6px;
 
  /* Position the tooltip text - see examples below! */
  position: absolute;
  z-index: 1;
}

/* .tooltip .tooltiptext { */
  /* width: 120px; */
  /* bottom: 100%; */
  /* left: 50%; */
  /* margin-left: -60px; /* 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 .tooltiptext {
  visibility: visible;
}