body {margin: 0; padding: 0;}
#top {background: url(bk_ejemplo.gif) repeat-x; margin: 0 0 20px 0; padding: 0 20px;}
#ejemplos {padding: 0 20px;}

h1 {border-bottom: 1px solid #000; font-size: 24px; font-style: italic; margin: 10px 0;}
h2 {font-size: 22px; margin: 25px 0 8px 0;}
h3 {font-size: 20px; margin: 15px 0 8px 0;}