#qrcode {
    border: 1px solid #ccc;
    padding: 10px;
    display: inline-block;
}
input {
    padding: 5px;
    font-size: 16px;
    height: 30px;
    width: 600px;
}
button {
    padding: 5px 10px;
    font-size: 16px;
    margin-left: 5px;
}