html,
body {
    margin: 0;
    width: 100%;
    height: 100%;
    background: #fdfdfd;
}

body {
    display: grid;
    place-items: center;
    overflow: hidden;
}

img {
    display: block;
    max-width: 100%;
    max-height: 96vh;
    width: auto;
    height: auto;
}