html { font-size: 12pt; }

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



img{
    max-width: 100%;
}

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

}


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