codepens/pie-chart-with-pure-css/dist/style.css

.pie-chart {
  width: 340px;
  height: 340px;
  background: conic-gradient(#8b22ff 0% 25%, #ffc33b 25% 56%, #21f3d6 56% 100%);
  border-radius: 50%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}