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;}
}
@media (min-width:640px){
    .two-columns-example {
        display:flex;}
        .two-columns-example > *
        {width:50%;}
        
    
}