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2024-c1230660 / kadai_a_5-1.html
<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <title>カウントダウンゲーム</title>
    
    <style>
        .box {
            width: 50px;
            height: 50px;
            margin: 10px;
            background-color: lightblue;
            display: inline-block;
            text-align: center;
            line-height: 50px;
            font-size: 20px;
        }
        #infobox {
            margin-top: 20px;
            font-size: 24px;
        }
    </style>
    
</head>

<body>
    <h1>3秒以内に「当たり」を見つけよう!</h1>
    
    <div id="game">
        <div class="box">1</div>
        <div class="box">2</div>
        <div class="box">3</div>
        <div class="box">4</div>
        <div class="box">5</div>
        <div class="box">6</div>
        <div class="box">7</div>
        <div class="box">8</div>
        <div class="box">9</div>
        <div class="box">10</div>
    </div>
    
    <button id="startButton">スタート</button>

</body>
</html>