body {
      margin: 0.5em auto;
      max-width: 60ch;
      line-height: 1.4;
      font-size: 1em;
      color:#000000;
      font-family: sans-serif;
    }
html {background:#fff;}
a {color: blue; font-size: 1em;
a.visted {color: purple;}
hr {color: gray;}