index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>HTML :: CSS :: JS - Auto Refresh</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
    <div class="container">
    <div class="row">
        <div class="col-sm">
            <div class="form-check form-switch">
                <input class="form-check-input" type="checkbox" id="autoRefresh" checked>
                <label class="form-check-label" for="autoRefresh">Auto refresh</label>
            </div>
        </div>
        <div class="col-sm">
            <label for="refreshInterval">Seconds</label>
            <input type="number" id="refreshInterval" value="10">
        </div>
        <div class="col-sm" id="date">3</div>
    </div>
</div>

<script src="js/app.js"></script>
<script src="js/bootstrap.min.js"></script>
</body>
</html>