.form-control{
    position: relative;
}
.invalid-tooltip {
    position: absolute;
    top: 110%;
    right: 0;
    z-index: 5;
    display: none;
    max-width: 100%;
    padding: .25rem .5rem;
    margin-top: .1rem;
    font-size: .875rem;
    line-height: 1.5;
    color: #fff;
    background-color: rgba(220, 53, 69, .9);
    border-radius: .25rem;
}
.is-invalid~.invalid-feedback, .is-invalid~.invalid-tooltip, .was-validated :invalid~.invalid-feedback, .was-validated :invalid~.invalid-tooltip {
    display: block;
}