html {
    font-size: 12pt;
}



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


@media (min-width: 640px) {

.two-columns-example {
    display:flex;
 }

.two-columns-example > * {
    width: 50%;
}

}


img {
    max-width: 100%
}

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