.img {
    max-width: 100%;
}

body {
margin-left: auto;
margin-right: auto;
width: 90%;
max-width: 40rem;
}

html {
    font-size: 12pt;
}

@media (min-width: 640px) {
    html { font-size: 16pt;}}

.two-columns-example {
    display: flex;
}
.two-columns-example {
    width: 50%;
}