body {
    position: relative;
    background-image: url('images/bg_h.webp');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    min-height: 100vh;
    z-index: 0;
}

@media (orientation: portrait) {
    body {
        background-image: url('images/bg_v.webp');
    }
}