html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #260000;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
}

a {
    display: contents;
}

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