.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

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

.card {
    padding: 10px;
    border-bottom: 1px solid green;
}

@media (max-width: 800px) {
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
}