table.sudoku {
  border: 3px solid #000;
  border-collapse: collapse;
}

table.sudoku td {
  font-family: "Trebuchet MS", sans-serif;
  font-size: 1.2em;
  border: 1px solid #9ac;
  text-align: center;
  vertical-align: middle;
  padding: 0;
  width: 1.5em;
  height: 1.5em;
  empty-cells: show;
}

table.sudoku tr {
  height: 1.5em;
}

td.tbr {
  border-right: 1px solid #000 !important;
}

td.tbl {
  border-left: 1px solid #000 !important;
}

tr.tbb td {
  border-bottom: 1px solid #000 !important;
}

tr.tbt td {
  border-top: 1px solid #000 !important;
}

table.sudoku tbody {
  border-top: 1px solid #000;
  border-bottom: 1px solid #000;
}

.sdh {
  color: #9af;
  visibility: visible;
}

table.sudoku:hover span {
  color: #9af;
}

input.x {
  border-width: 0;
  background: inherit;
  margin: 0;
  padding: 0;
  font: inherit;
  width: 1.4em;
  height: 1.4em;
  text-align: center;
}

p.i {
	background-color:#fff9e6;
	border:1px solid #bbb;
	margin:1em 20em 1em 0;
	padding:0.25em 1em;
}