index.html

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="CSSBootsrap-css.css">
    <link rel="stylesheet" href="CSS/cat.css">
    <script src="JS/cat.js"></script>

    <title>Cat Generator</title>
</head>

<body class="body">

    <div class="container-2">
        <h1>Cat Generator</h1>

        <div class="btn-set">
            <div class="cat-gen-btn-2">
                <button class="btn btn-success" id="cat-gen-btn" onclick="catgen()">Generate</button>
            </div>

            <div class="cat-gen-btn-2">
                <button class="btn btn-danger" onclick="reset()">Reset</button>
            </div>
        </div>

        <div class="flex-box-2" id="flex-cat-gen">
        </div>

    </div>

</body>

</html>