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dabblet.css

html {
  background: #eee;
}

body {
  width: 600px;
  height: 600px;
  border: 10px solid #000000;
  border-radius: 50%;
  position: relative;
  background-color: white;
  background-image: linear-gradient(90deg, transparent 50%, #000000 50%, #000000);
  margin: auto;
}

body::before {
  content: "";
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: block;
  position: absolute;
  left: 150px;
  background: black;
  top: 0;
  border: 100px solid #ffffff;
}

body::after {
  content: "";
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: block;
  position: absolute;
  left: 150px;
  top: 300px;
  background: white;
  border: 100px solid #000000;
}

settings.json

{"view":"split-vertical","fontsize":"80","seethrough":"","prefixfree":"1","page":"css"}