use css nth-child for regions' borders
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								game.php
									
									
									
									
									
								
							
							
						
						
									
										12
									
								
								game.php
									
									
									
									
									
								
							@ -26,16 +26,6 @@
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                        <tr>
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<?php
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            for ($column = 0; $column < 9; $column++) {
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                switch($row%3) {
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                    case 0: $classRegionRow = "regionTop"; break;
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                    case 1: $classRegionRow = "regionMiddle"; break;
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                    case 2: $classRegionRow = "regionBottom"; break;
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                }
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                switch($column%3) {
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                    case 0: $classRegionColumn = "regionLeft"; break;
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                    case 1: $classRegionColumn = "regionCenter"; break;
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                    case 2: $classRegionColumn = "regionRight"; break;
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                }
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                $value = $gridStr[9*$row+$column];
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                if ($value == "?") {
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                    $value = "";
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@ -43,7 +33,7 @@
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                } else {
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                    $disabled = " disabled";
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                }
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                echo "                            <td class='$classRegionRow $classRegionColumn'><input type='text' inputmode='numeric' minlength=0 maxlength=1 value='$value'$disabled/></td>\n";
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                echo "                            <td><input type='text' inputmode='numeric' minlength=0 maxlength=1 value='$value'$disabled/></td>\n";
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            }
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?>
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                        </tr>
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										54
									
								
								style.css
									
									
									
									
									
								
							
							
						
						
									
										54
									
								
								style.css
									
									
									
									
									
								
							@ -16,83 +16,69 @@ div {
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table {
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    border-spacing: 0;
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    border: 1px solid black;
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    border-radius: 6px;
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}
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td, tr {
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    padding: 0;
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}
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table tr:first-child td:first-child {
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    border-top-left-radius: 6px;
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tr:first-child td:first-child {
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    border-top-left-radius: 5px;
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}
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table tr:first-child td:first-child > input {
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tr:first-child td:first-child input {
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    border-top-left-radius: 4px;
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}
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table tr:first-child td {
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    border-top: 2px solid black;
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tr:first-child td:last-child {
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    border-top-right-radius: 5px;
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}
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table tr:first-child td:last-child {
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    border-top-right-radius: 6px;
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}
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table tr:first-child td:last-child > input {
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tr:first-child td:last-child input {
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    border-top-right-radius: 4px;
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}
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table tr td:first-child {
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    border-left: 2px solid black;
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tr:last-child td:first-child {
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    border-bottom-left-radius: 5px;
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}
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table tr td:last-child {
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    border-right: 2px solid black;
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}
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table tr:last-child td:first-child {
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    border-bottom-left-radius: 6px;
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}
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table tr:last-child td:first-child > input {
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tr:last-child td:first-child > input {
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    border-bottom-left-radius: 4px;
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}
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table tr:last-child td {
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    border-bottom: 2px solid black;
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tr:last-child td:last-child {
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    border-bottom-right-radius: 5px;
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}
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table tr:last-child td:last-child {
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    border-bottom-right-radius: 6px;
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}
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table tr:last-child td:last-child > input {
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tr:last-child td:last-child input {
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    border-bottom-right-radius: 4px;
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}
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.regionTop {
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tr:nth-child(3n+1) td {
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    border-top: 1px solid black;
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}
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.regionMiddle {
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tr:nth-child(3n+2) td {
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    border-top: 1px solid grey;
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    border-bottom: 1px solid grey;
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}
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.regionBottom {
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tr:nth-child(3n) td {
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    border-bottom: 1px solid black;
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}
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.regionLeft {
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td:nth-child(3n+1) {
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    border-left: 1px solid black;
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}
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.regionCenter {
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td:nth-child(3n+2) {
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    border-left: 1px solid grey;
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    border-right: 1px solid grey;
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}
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.regionRight {
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td:nth-child(3n+3) {
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    border-right: 1px solid black;
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}
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