img {
    display: inline-block;
    width: 100%;
    height: auto;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
}

body main {
    flex-grow: 1;
}

@media (max-width: 1800px) {
    body .order-l1 {
        order: 1;
    }
}

@media (max-width: 1200px) {
    body .order-m1 {
        order: 1;
    }
}

body .placeholder {
    max-width: 100%;
    aspect-ratio: 4/3;
    display: block;
    background-color: #ccc;
}