Setting config.background doesn't change the colour

[tinacious]

Following the instructions in the readme, setting the config.background to a hex value doesn't actually change the appearance of the generated SVG. I can see that a rectangle with the colour I've indicated is drawn, but it must be layered underneath the others because the appearance of the badge does not change.

This, for example, is the line that is added:

<rect height="20" width="120" rx="3" fill="#FF3399"/>

This is the badge image that is generated:

The total badge output is as follows (formatted for readability):

<svg contentScriptType="text/ecmascript" contentStyleType="text/css" preserveAspectRatio="xMidYMid meet" version="1.0"
  height="20" width="120" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <linearGradient id="smooth" x2="0" y2="120">
    <stop offset="0" stop-color="#bbb" stop-opacity=".1" />
    <stop offset="1" stop-opacity=".1" />
  </linearGradient>
  <clipPath id="round">
    <rect height="20" width="120" rx="3" fill="#FF3399" />
  </clipPath>
  <g clip-path="url(#round)">
    <rect height="20" width="60" fill="#555" />
    <rect x="60" height="20" width="60" fill="#cccc00" />
    <rect height="20" width="120" fill="url(#smooth)" />
  </g>
  <g fill="#fff" text-anchor="middle" font-family="Verdana,sans-serif" font-size="11">
    <text x="30" y="15" fill="#010101" fill-opacity="0.3">
      scov total
    </text>
    <text x="30" y="14">
      scov total
    </text>
  </g>
  <g fill="#fff" text-anchor="middle" font-family="Verdana,sans-serif" font-size="11">
    <text x="90" y="15" fill="#010101" fill-opacity="0.3">
      95%
    </text>
    <text x="90" y="14">
      95%
    </text>
  </g>
</svg>