<style type="text/css">
* {
	padding: 0;
margin: 0;
}
body {
margin-left: 0px;
	margin-top: 0px;
	margin-right: 0px;
	margin-bottom: 0px;
}
div.sudoku {
text-align: center;
padding-top: 20px;
margin:0 auto;
width: 500px;
z-index: 100;
}
div.sudoku select {
}
div.sudoku input{
	margin-top: 10px;
padding: 0px;
}
table.sudoku {
	margin-top: 10px;
border-collapse: collapse;
border: solid black 3px;
background-color: white;
}
table.sudoku td input {
	border: none;
padding: 0;
margin: 0;
text-align: center;
font-size: 25px;
background-color: white;
}
table.sudoku td input.predef {
	color: black;
}
table.sudoku td.topleft {
	height: 50px;
width: 50px;
border-top: solid black 3px;
border-bottom: solid black 1px;
border-left: solid black 3px;
border-right: solid black 1px;
}
table.sudoku td.middleleft {
	height: 50px;
width: 50px;
border-top: solid black 1px;
border-bottom: solid black 1px;
border-left: solid black 3px;
border-right: solid black 1px;
}
table.sudoku td.bottomleft {
	height: 50px;
width: 50px;
border-top: solid black 1px;
border-bottom: solid black 3px;
border-left: solid black 3px;
border-right: solid black 1px;
}
table.sudoku td.topmiddle {
	height: 50px;
width: 50px;
border-top: solid black 3px;
border-bottom: solid black 1px;
border-left: solid black 1px;
border-right: solid black 1px;
}
table.sudoku td.middlemiddle {
	height: 50px;
width: 50px;
border-top: solid black 1px;
border-bottom: solid black 1px;
border-left: solid black 1px;
border-right: solid black 1px;
}
table.sudoku td.bottommiddle {
	height: 50px;
width: 50px;
border-top: solid black 1px;
border-bottom: solid black 3px;
border-left: solid black 1px;
border-right: solid black 1px;
}
table.sudoku td.topright {
	height: 50px;
width: 50px;
border-top: solid black 3px;
border-bottom: solid black 1px;
border-left: solid black 1px;
border-right: solid black 3px;
}
table.sudoku td.middleright {
	height: 50px;
width: 50px;
border-top: solid black 1px;
border-bottom: solid black 1px;
border-left: solid black 1px;
border-right: solid black 3px;
}
table.sudoku td.bottomright {
	height: 50px;
width: 50px;
border-right: solid black 3px;
border-bottom: solid black 3px;
}
</style>