Sorta conical gradient
{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}
// alert('Hello world!');
<div></div>
/**
* Sorta conical gradient
*/
div {
width: 200px; height: 200px;
border-radius: 50%;
background: grey;
overflow: hidden;
}
div:before {
content: '';
display: block;
border: 100px solid;
border-color: yellow fuchsia aqua limegreen;
border-radius: 50%;
-webkit-filter: blur(40px);
}