body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}
h1 {
    font-size: 22px;
    color: #333;
}
.btn {
    display: block;
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    font-size: 16px;
    background: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.btn:hover {
    background: #0056b3;
}
#qrcode {
    display: none;
    margin-top: 20px;
}
#qrcode img {
    width: 200px;
    height: 200px;
}
#status {
    font-size: 16px;
    color: #555;
    margin-top: 15px;
}