.showTooltip {
    position: relative;
    margin: 0 auto;
    font-size: x-small;
    top: -10px;
    cursor: pointer;
}

.showTooltip:hover::after {
    position: absolute;
    content: attr(data-tooltip);
    bottom: 20px;
    background-color: #333;
    color: white;
    padding: .25em .5em;
    font-size: 16px;
    width: 300px;
}