.tooltip-box {
    position: relative;
    display: inline-block;
}
.tooltip-box .tooltip-text {
    visibility: hidden;
    width: 100px;
    background-color: black;
    color: #fff;
    text-align: center;
    padding: 6px 0;
    position: absolute;
    z-index: 1;
}
.tooltip-box:hover .tooltip-text {
    visibility: visible;
}