table

 .natural      { margin: 0pt, 0pt, 0pt, 0pt; padding: 0%; spacing: 0%; border: none }

td

 .nat2         { align: left; valign: top }

 .nat3         { color: #000000 ; border: 2px #000000 solid}

 .nat4         { border-style: inset; border-width: 2px; color: #000000 }

 .bottomline   { border: none; border-bottom: solid; border-width: 1px; color: #000000 }

 .top_left_corner  { border:none; border-top: solid; border-left: solid; border-width: 1px; color:#000000 }

 .top_right_corner { border: none; border-top: solid; border-right: solid; border-width: 1px; color: #000000 }

 .U            { border: none; border-top: solid; border-left: solid; border-right: solid; border-width: 1px; color: #000000 }

 .full_border  { border: none; border-top: solid; border-left: solid; border-right: solid; border-bottom: solid; border-width: 1px; color: #000000 }