Изменения

body {background: #FFF url(textbook.png) -16px 0 repeat fixed; color: #000; font-size: 2.25em;}

:link, :visited {text-decoration: none; color: #00C;}

#controls :active {color: #88A !important;}

#controls :focus {outline: 1px dotted #227;}

.slide code {color: #533;}

.slide code.bad, code del {color: red;}