body {
    padding: 0;
    margin: 0;
    background-color: #61676d;
}
.container {
    max-width: 960px;
    margin-top: 60px;
    padding: 20px;
}
#qrcode {
    width: 220px; 
    height: 220px; 
    margin: 0 auto;
    background-color: #ffffff; 
}