This can be due to:

color: #333; color: #FECC04; #footer { font-size: 48px; p { margin: 0 0 10px 0; font-size: 12px; http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html font-size: 24px; margin: 0 0 30px 0; } Error 404 :( margin: 0; padding: 0; Pay attetion to UPPER and LOWER cases
width: 540px; margin: 0 0 20px 0; } font-family: Arial, Helvetica, sans; padding: 15px 0 5px 0;