html {
    height: 100%;
}
body {
    margin: 0;
    padding: 30px;
    overflow: hidden;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: center;
    align-items: center;
    align-content: normal;
    width: calc(100% - 60px);
    height: calc(100% - 60px);
}
img {
    max-width: 100%;
}