html{
    font-size: 12pt;
}

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