#content a.menucorso{
  display:block;
  width:225px;
  height:25px;
  line-height:25px;
  color: #526698;
  font-weight:bold;
  text-decoration:none;
  margin:4px auto;
  background: transparent url(/images/menucorsobtn.gif) top left no-repeat;
}

ul.programma li.lezione {
 margin-bottom: 5px;
}