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

.hover-text::after {
    content: attr(data-hover-text);
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0,0,0,.8);
    color: #fff;
    padding: 5px;
    border-radius: 5px;
    font-size: 14px;
    opacity: 0;
    transition: opacity .3s ease-in-out
}

.hover-text.active::after,.hover-text:hover::after {
    opacity: 1
}