JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bg"></div>

CSS

body {
    margin: 0;

}
#bg {
    height: 100vh;
    background: radial-gradient(circle at 70%, 
        #78C0FA 10%, 
        #6CBBF6 10%, #6BBBF8 20%,
        #60B5F8 20%, #5EB5F8 30%,
        #51AFF5 30%, #51AFF7 50%, 
        #42A7F5 50%);
}