.invalid-tooltip {
    position: absolute;
    top: 6px;
    right: 50px;
    z-index: 5;
    display: none;
    max-width: 100%;
    padding: 0.25rem 0.5rem;
    margin-top: 0.1rem;
    font-size: 11px;
    line-height: 1.5;
    color: #fff;
    background-color: rgba(220,53,69,.9);
    border-radius: 0.25rem;
}