<?xml version="1.0"?>

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <g stroke="black" stroke-width="1" fill-opacity=".5">
    <circle cx="50" cy="40" r="20" fill="red"/>
    <circle cx="40" cy="60" r="20" fill="yellow"/>
    <circle cx="60" cy="60" r="20" fill="blue"/>
  </g>
</svg>

