.field--type-add-to-calendar-field
{
    max-width: 83.33333%;
    margin: 0 auto 30px;

    flex: 0 0 83.33333%;
}

@media (max-width: 991.98px)
{
    .field--type-add-to-calendar-field
    {
        max-width: 100%;

        flex: 0 0 100%;
    }
}