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

div {
    position: relative;
    height: 100%;
    width: 100%;
}

    div img {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        margin: auto;
        width: 50%;
    }