body {font-family: Georgia, "Times New Roman", serif; max-width: 60em; margin: 2em auto; padding: 0 1em; line-height: 1.5}
nav {float:left; width: 16em}
nav ul {list-style:none; padding:0}
main {margin-left: 18em}
img {max-width:100%}
a.current {font-weight:bold}
footer {clear:both; margin-top:2em; font-size:small}
@media (max-width: 50em) { nav {float:none; width:auto} main {margin-left:0} }