body {
    margin: 0;
    padding: 0;
}

#blur {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    box-shadow: inset 0 0 1000px 20px #000;
    z-index: 1;
}

#container {
    top: 50vh;
    left: 50vw;
    position: fixed;
    width: 0;
    height: 0;
    overflow: visible;
}

#image {
    position: relative;
    display: block;
    transform: translateX(-50%) translateY(-50%);
}