body.flag-icon-page-background:before,
body.flag-icon-page-background:after {
    content: "";
    position: fixed;
    bottom: 0;
    left: 0;
    background-size: 20vw 20vw;
    background-position: bottom left;
    background-repeat: no-repeat;
    width: 20vw;
    height: 20vw;
    z-index: -100;
}

body.flag-icon-page-background:after {
    background: radial-gradient(circle at bottom left, transparent 5%,var(--color-background-body) 60%);
}