html, body
{
    margin: 0;
    padding: 0;

    height: 100%;
    min-height: 100%;

    //scrollbar-width: none;
}

body
{
    background-color: black;
    margin: 0;
}

#background_container
{
    position: fixed;
    height: 100%;
    width: 100%;

    z-index: var(--background_z-index);
}

#background_image
{
    position: relative;
    display: block;
    background-position: center;
}

#shadow_container
{
    position: fixed;
    height: 100%;
    width: 100%;

    z-index: calc(var(--background_z-index) + 1);
}

#shadow_image
{
    position: relative;
    display: block;
    background-position: center;

    opacity: 0.5;
}