body {
	background:
radial-gradient(circle closest-side at 60% 43%, #b03 26%, rgba(187,0,51,0) 27%),
radial-gradient(circle closest-side at 40% 43%, #b03 26%, rgba(187,0,51,0) 27%),
radial-gradient(circle closest-side at 40% 22%, #d35 45%, rgba(221,51,85,0) 46%),
radial-gradient(circle closest-side at 60% 22%, #d35 45%, rgba(221,51,85,0) 46%),
radial-gradient(circle closest-side at 50% 35%, #d35 30%, rgba(221,51,85,0) 31%),

radial-gradient(circle closest-side at 60% 43%, #b03 26%, rgba(187,0,51,0) 27%) 50px 50px,
radial-gradient(circle closest-side at 40% 43%, #b03 26%, rgba(187,0,51,0) 27%) 50px 50px,
radial-gradient(circle closest-side at 40% 22%, #d35 45%, rgba(221,51,85,0) 46%) 50px 50px,
radial-gradient(circle closest-side at 60% 22%, #d35 45%, rgba(221,51,85,0) 46%) 50px 50px,
radial-gradient(circle closest-side at 50% 35%, #d35 30%, rgba(221,51,85,0) 31%) 50px 50px;
background-color:#b03;
background-size:100px 100px;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.