#intro-cards .card-flip, 
#intro-cards .card.bg-secondary {
    height: 560px !important;
}


#intro-cards .card.bg-secondary:not(.card-back) {
    display: flex;
    flex-direction: column;
}
#intro-cards .card.bg-secondary:not(.card-back) .p-5 {
    flex-grow: 1;
}


#intro-cards .card-back .card-body {
    display: flex;
    flex-direction: column;
    justify-content: center !important;
    padding: 0; 
}