body::before{

    content:'';

    position:fixed;

    top:-300px;
    left:-300px;

    width:700px;
    height:700px;

    background:#00d9ff;

    opacity:.08;

    border-radius:50%;

    filter:blur(200px);

    z-index:-2;

}

body::after{

    content:'';

    position:fixed;

    right:-250px;
    bottom:-250px;

    width:650px;
    height:650px;

    background:#00d9ff;

    opacity:.05;

    border-radius:50%;

    filter:blur(180px);

    z-index:-2;

}