.tooltip {
    position: relative;
}
.tooltip > div {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    margin-left: -150px;
    width: 300px;
    
}
.tooltipContent {
    background-color: #eee;
    border: 1px solid #555;
    border-radius: 5px;
    padding: 5px;
}