CodePen Embed - first example

<div class="box"></div>

.box {
  width: 200px;
  aspect-ratio: 1;
  border: 1px solid;
  background: conic-gradient(at 75% 25%, red, blue, yellow)
}

This Pen is owned by Temani Afif on CodePen.

This Pen doesn't use any external CSS resources.

This Pen doesn't use any external JavaScript resources.