[CSS] 3D Cube

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<!doctype html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <title>Cube</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
<div class="cube-container">
    <div class="cube">
        <div class="front">1</div>
        <div class="right">2</div>
        <div class="top">3</div>
        <div class="bottom">4</div>
        <div class="left">5</div>
        <div class="back">6</div>
    </div>
</div>
</body>
</html>
    