BODY { background-image: url(http://www.arcetri.inaf.it/irlab/icons/fireg.png)  }
  div    { border-top: solid medium navy  }
   H1 {text-align: center;font: 900 30pt monospace}
   H2 {text-align: center}
   H3 {text-align: center}
  HR  { width: 50%   ;  size: 8pt }
   P {text-align: center}
   IMG {vertical-align: top}
   P.cent {text-align: center}
   P.lefted {text-align: left;margin-left: 2em;margin-right: 2em}
   P.right {text-align: right}
   TD.lefted {align: left;margin-left: 2em;margin-right: 2em}
   DIV {text-align: center}
   TH.due {text-align: center;margin-left: 1em;margin-right: 1em}
   TD.due {text-align: center}
   TH.c {text-align: center}
   TH.l {text-align: left;margin-right: 4em}
   TD.l {text-align: left}
   TH.r {text-align: right;margin-left: 4em}
   TD.r {text-align: right}