Générateur de codes QR HTML, JavaScript

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>QR Code Generator</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js"></script>
    <style>
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f2f5;
        }
        .card {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            text-align: center;
            width: 100%;
            max-width: 400px;
        }
        h1 {
            color: #333;
            margin-bottom: 1.5rem;
        }
        input {
            width: 100%;
            padding: 12px;
            margin-bottom: 1rem;
            border: 2px solid #ddd;
            border-radius: 6px;
            box-sizing: border-box;
            font-size: 16px;
            outline: none;
            transition: border-color 0.3s;
        }
        input:focus {
            border-color: #007bff;
        }
        button {
            width: 100%;
            padding: 12px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #0056b3;
        }
        #qrcode {
            margin-top: 2rem;
            display: flex;
            justify-content: center;
        }
        #qrcode img {
            border: 10px solid #fff;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
    </style>
</head>
<body>

<div class="card">
    <h1>QR Generator</h1>
    <input type="text" id="qr-input" placeholder="Enter text or URL" value="https://example.com">
    <button onclick="generateQR()">Generate Code</button>
    <div id="qrcode"></div>
</div>

function generateQR() {
        const input = document.getElementById("qr-input");
        if (input.value.trim() === "") {
            alert("Please enter some text or a URL");
            return;
        }
        qrcode.makeCode(input.value);
    }

// Generate initial QR on load
    generateQR();
</script>

</body>
</html>

CSS