/* Tooltip container */
.hastooltip {
    position: relative;
    display: inline-block;
    /*border-bottom: 1px dotted black;  If you want dots under the hoverable text */
}

/* Tooltip text */
.tooltiptext {
    visibility: hidden;
    width: 300px;
    background-color: #555;
    color: #fff;
    text-align: center;
    padding: 5px 0;
    border-radius: 6px;
    /* Position the tooltip text */
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    /* Fade in tooltip */
    opacity: 0;
    transition: opacity 0.3s;
}

    /* Tooltip arrow */
    .hastooltip .tooltiptext::after {
        content: "";
        position: absolute;
        top: 100%;
        left: 50%;
        margin-left: -5px;
        border-width: 5px;
        border-style: solid;
        border-color: #555 transparent transparent transparent;
    }

/* Show the tooltip text when you mouse over the tooltip container */
.hastooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}