Template:MMC-UNI2/Card/styles.css

.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
  }
  
.tooltip .tooltiptext {
    visibility: hidden;
    width: 300px;
    background-color: rgb(36, 36, 36);
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -150px;

    opacity: 0;
    transition: opacity 0.3s;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.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: black transparent transparent transparent;
}