.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: none;
    font-size: 15px;
    opacity: 1;
}

    .tooltip .tooltiptext {
        visibility: hidden;
        width: 120px;
        background-color: black;
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 5px 0;
        position: absolute;
        z-index: 1;
    }

    .tooltip:hover .tooltiptext {
        visibility: visible;
    }

    .tooltip > .fa {
        color:red;
    }