.container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 20px;
    box-sizing: border-box;
}

.child {
    flex: 1 1 45%;
    min-width: 250px;
    background-color: #aeadad;
    box-sizing: border-box;
    border-radius: 8px;
}

@media (max-width: 600px) {
    .child {
        flex: 1 1 100%;
    }
}