I'm new to SVG and a bit surprised that this example is cropped and not scaled? Whats missing to make it scaleable/sizeable using width/height in the svg element? 

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     version="1.1"
     width="200px"
     height="200px"
     viewBox="0 0 400px 400px">
  <g fill-opacity="0.7" stroke="black" stroke-width="0.1cm">
    <circle cx="200px" cy="60px" r="100" fill="red"
                    transform="translate(0,50)" />
    <circle cx="200px" cy="60px" r="100" fill="blue"
                    transform="translate(70,150)" />
    <circle cx="200px" cy="60px" r="100" fill="green"
                    transform="translate(-70,150)" />
  </g>
</svg>
svg
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