Template:Tooltip/styles.css

/* Tooltip container */
.tooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px;
}

/* Tooltip text */
.tooltip .tooltiptext {
  visibility: hidden;
  width: 120px;
  text-align: center;
  padding: 3px;
  border-radius: 6px;
  border: 1px #a2a9b1 solid;
  /* Position the tooltip text - see examples below! */
  bottom: 100%;
  left: 50%;
  margin-left: -60px; /* Use half of the width (120/2 = 60), to center the tooltip */
  position: absolute;
  z-index: 1;
}

/* Tooltip Arrow */
.tooltip .tooltiptext::after {
  content: " ";
  position: absolute;
  top: 100%; /* At the bottom of the tooltip */
  left: 50%;
  margin-left: -5px;
  border-width: 5px;
  border-style: solid;
  border-color: #a2a9b1 transparent transparent transparent;
}

/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover .tooltiptext {
  visibility: visible;
}