.slide>.qr-code {
    position: absolute;
    top: 3vw;
    right: 3vw;
    border: 15px solid #ffffff;
    border-radius: 6px;
}

@media only screen and (orientation: portrait) {
    .slide>.qr-code {
        top: 5vw;
        right: 5vw;
    }
}