body {
    height: 10em;
}

.center {
    width: 10em;
    margin: auto;
    margin-top: 10em;
}

.text {
    position: relative;
    display: inline-block;
}

.text .tooltip {
    background-color: rgba(128, 0, 128, 0.85);
    color: white;
    text-align: center;
    padding: 0.5em 1em;
    border-radius: 0.5em;
    position: absolute;
    opacity: 0;
    bottom: 100%;
    z-index: 10;
    animation-fill-mode: forwards;
    transition: 0.2s ease-in-out;
    transition-property :opacity, bottom;
}

.text:hover .tooltip {
    opacity: 1;
    bottom: 120%;
}