body {
    margin: 0;
    font-family: sans-serif;
    text-align: center;
}

img {
    max-width: 100%;
    height: auto;
}

/* Default: Sembunyikan gambar desktop, tampilkan mobile (Mobile First) */

.img-desktop {
    display: none;
}

.img-mobile {
    display: block;
}

/* Resolusi Besar (Desktop): Di atas 768px */
@media (min-width: 768px) {
    .img-desktop {
        max-width:100%;
	height:auto;
	display: block;
        margin: 0 auto;
    }
    
    .img-mobile {
        display: none;
    }
}