table,th,td{border:1px solid black;border-collapse:collapse}td{width:60px;height:60px;text-align:center;position:relative}.help{position:absolute;top:0;left:0;font-size:xx-small;width:100%;height:100%;color:#000;word-wrap:break-word}#selector{border:2px solid black;width:90;height:150px;display:none;position:absolute;top:0;left:0;background-color:#ff0}#selector-table{margin-left:auto;margin-right:auto}#selector-table td{width:30px;height:30px}#selector-table td:hover,#sudokuTable td:hover{background-color:green}#sudokuTable tr{border-left:3px solid rgb(0,0,0)}#sudokuTable tr:nth-of-type(1){border-top:3px solid rgb(0,0,0)}#sudokuTable td:nth-of-type(3n){border-right:3px solid rgb(0,0,0)}#sudokuTable tr:nth-of-type(3n) td{border-bottom:3px solid rgb(0,0,0)}table{margin-left:auto;margin-right:auto}