JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a"></div>

CSS

div {
    top: 100px;
    position: relative;
    height: 200px;
    width: 200px;
    opacity: 0.5;
    border-radius: 50%;
}
div:before {
    content: "";
    display: block;
    position: absolute;
    right: -10%;
    bottom: -10%;
    width: 50%;
    height: 50%;
    border-radius: 50%;
    opacity: 0.5;
    background-image: radial-gradient(100% 100% at 40% 60%, red, #F2F2F2);
}

div:after {
    content: "";
    display: block;
    position: absolute;
    right: -200%;
    bottom: -40%;
    opacity: 0.5;
    width: 180%;
    height: 180%;
    border-radius: 50%;
    background-image: radial-gradient(60% 60% at 40% 50%, blue, #F2F2F2);
}
.a {
    width: 100px;
    height: 100px;
    background: gray;
    background-image: radial-gradient(100% 100% at 30% 50%, yellow, #F2F2F2);
}