:root {
    --page-height: 100vh;
}

html, body {
    margin: 0;
    width: 100vw;
    min-height: var(--page-height);
    height: var(--page-height);
    background-color: #181818;
    display: flex;
    align-items: center;
    justify-content: center;
}

#main-image {
    width: auto;
    height: 100vw;
    display: block;
    transform: rotate(90deg);
    transform-origin: center center;
}