.river
{
  text-align:center;
}

.river .block
{
  background:#d1b284; 
  background:#ffc; 
  background:#a8a800; 
  background:#CFB597; 
  background:#eee5db; 
  border:5px ridge #ccbbaa;
}

.river .ex
{
  font-family: Arial, sans-serif; 
  font-size:30px;
  color:red;
  font-weight:bold;
  text-align:left;
}

.river .st
{
  font-size:14pt;
  vertical-align:middle;
}