body {max-width: 800px; margin: 3em; font-family: sans-serif;
font-size: 15px; line-height: 1.4em;}
#columns { 
-webkit-column-count: 2; 
    -moz-column-count: 2; 
    column-count: 2;}
img {max-width: 390px; margin: 1em 0; display: block; border: 1px solid gray;}
li {list-style: none;}
h1 {font-size: 1.8em; margin-top: 0.5em;}
h2 {font-size: 1.4em;}
h3, h4 {font-size: 1.1em}
ul ul {margin-top: 1em;}
a {color: blue; text-decoration: none; border-bottom: 1px solid blue;}
a:visited {color: purple; border-bottom: 1px solid purple;}