body {
    background: #f9f9f9;
    font-family: arial, helvetica;
    font-size: 18px;
    padding: 30px;
}
h1 {
    margin: 0 0 15px;
    font-size: 1.7rem;
}
main {
    max-width: 960px;
    margin: 60px auto;
}
section {
    padding: 60px;
    background: #fff;
    border-radius: 15px;
    margin-bottom: 30px;
}
.qr-code img {
    max-width: 100%;
}
.text-capitalize {
    text-transform: capitalize;
}
.img-fluid {
    max-width: 100%;
}