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2021-fuga / kadai7.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width" />
  <title>ライツアウトパズル</title>
  <link rel="stylesheet" href="kadai7.css" type="text/css">
</head>
<body>
  <h1>ライツアウトパズル</h1>
  <h2>ボタンをクリックするとその上下左右にあるボタンの色が青・グレーに変わります。全てのボタンの色を青に変えたらクリアです。</h2>

<div class="box2">
<div class="box1 colorblue" id="box1">1</div>
<div class="box1 colorblue" id="box2">2</div>
<div class="box1 colorblue" id="box3">3</div>
<div class="box1 colorblue" id="box4">4</div>
<div class="box1 colorblue" id="box5">5</div>
</div>

<div class="box2">
<div class="box1 colorblue" id="box6">6</div>
<div class="box1 colorblue" id="box7">7</div>
<div class="box1 colorblue" id="box8">8</div>
<div class="box1 colorblue" id="box9">9</div>
<div class="box1 colorblue" id="box10">10</div>
</div>

<div class="box2">
<div class="box1 colorblue" id="box11">11</div>
<div class="box1 colorblue" id="box12">12</div>
<div class="box1 colorgray" id="box13">13</div>
<div class="box1 colorblue" id="box14">14</div>
<div class="box1 colorblue" id="box15">15</div>
</div>

<div class="box2">
<div class="box1 colorblue" id="box16">16</div>
<div class="box1 colorblue" id="box17">17</div>
<div class="box1 colorblue" id="box18">18</div>
<div class="box1 colorblue" id="box19">19</div>
<div class="box1 colorblue" id="box20">20</div>
</div>

<div class="box2">
<div class="box1 colorblue" id="box21">21</div>
<div class="box1 colorblue" id="box22">22</div>
<div class="box1 colorblue" id="box23">23</div>
<div class="box1 colorblue" id="box24">24</div>
<div class="box1 colorblue" id="box25">25</div>
</div>

  <script src="kadai7.js"></script>
</body>
</html>