* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #111;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

main {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
}