.qrcode-wrapper {
    display: inline-block;
    background: #c2c2c2 !important;
    padding: 0px;
    height: 286px; /* 256px height + 15px border top + 15px border bottom */
    border: 15px solid #ffffff !important;
    border-radius: 10px;
}
.qrcode-wrapper canvas,
.qrcode-wrapper img {
    display: block;
    margin-top: -15px;
}