.tooltip-simple {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
}

    .tooltip-simple .tooltiptext-simple {
        visibility: hidden;
        width: 200px;
        background-color: #fff;
        color: var(--primary-color);
        text-align: center;
        border-radius: 6px;
        padding: 5px 0;
        position: absolute;
        z-index: 1;
        bottom: 125%;
        left: 50%;
        margin-left: -100px;
        opacity: 0;
        transition: opacity 0.3s;
    }

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

    .tooltip-simple:hover .tooltiptext-simple {
        visibility: visible;
        opacity: 1;
    }