.jqstooltip {
    background: rgba(0,0,0,0.85) !important;
    color: #fff !important;
    border: none !important;
    border-radius: 6px !important;

    /* --- size of tooltip --- */
    width: 32px !important;      /* increase for larger box */
    height: 24px !important;

    padding: 0 !important;
    font-size: 12px !important;

    /* --- center text --- */
    display: flex !important;
    align-items: center !important;   /* vertical center */
    justify-content: center !important; /* horizontal center */
    text-align: center !important;

    /* --- avoid clipping --- */
    white-space: nowrap !important;

    /* remove the little pointer arrow */
    box-sizing: border-box !important;
}