.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.card--small {
    grid-column: span 1;
}

.card--medium {
    grid-column: span 2;
}

@media (max-width: 768px) {
    .cards {
        grid-template-columns: 1fr;
    }
}