.hovertext {
    position: relative;
    border-bottom: 1px dotted black;
}

.hovertext_noline {
    position: relative;
}

.hovertext:before, .hovertext_noline:before{
    content: attr(data-hover);
    visibility: hidden;
    opacity: 0;
    width: 180px;
    background-color: #3C473A;
    color: #fff;
    text-align: center;
    border-radius: 5px;
    padding: 5px 5px;
    transition: opacity 1s ease-in-out;
    position: absolute;
    z-index: 1;
    left: 0;
    top: 110%;
}

.hovertext:hover:before, .hovertext_noline:hover:before{
    opacity: 1;
    visibility: visible;
}