<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:h="http://www.w3.org/1999/xhtml"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     width="300" height="200" viewBox="0 0 300 200">
  <style>
    rect {
      fill: green;
    }
  </style>
  <g transform="translate(140, 130)">
    <rect x="-30" y="-20" width="80" height="30"/>
  </g>
</svg>