html, body {
    height: 100%;
    margin: 0;
    overflow-y: hidden;
}

.bg {
}

.bg img {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    height:
}

@media (min-width: 1921px){
    .bg img {
        max-height: 90%;
    }
}