CSS
body:before { content: ""; position: fixed; top: -500px; left: 25%; width: 50%; height: 500px; z-index: 0; box-shadow: 0px 0px 200px 20px rgba(226, 240, 255, 0.9), 0px 5px 300px 100px rgba(226, 240, 255, 0.7), 0px 15px 500px 250px rgba(226, 240, 255, 0.5); border-radius: 400px; }