body,html{ margin:0; padding:0}div#sudoku{ text-align:center}#sudoku table{ border:3px solid #000; margin:0px auto; empty-cells:show}#sudoku td.borderright{ border-right:3px solid #000}#sudoku td.borderbottom{ border-bottom:3px solid #000}#sudoku td.borderbottomright{ border-bottom:3px solid #000; border-right:3px solid #000}#sudoku td{ width:36px; line-height:36px; height:36px; color:#4e5661; font-size:26px; font-weight:bold; font-family:verdana,geneva,arial,helvetica,sans-serif; text-align:center; background:none; position:relative; border:1px solid #000}#sudoku input{ cursor:default; width:30px; margin:0; padding:0; font-size:26px; font-weight:bold; font-family:verdana,geneva,arial,helvetica,sans-serif; text-align:center; background:none; border:none}.knopf{  margin:2px; width:105px; font-family:verdana,geneva,arial,helvetica,sans-serif; text-align:center}