SVG Triangle Animation

HTML
1
<svg id="triangle" width="300px" height
    ="300px" viewBox="-3 -4 39 39">
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CSS
1
2
html, body {
background: url('https://s3-us-west-2
      .amazonaws.com/s.cdpn.io/242518
      /dark_wall.png');
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JAVASCRIPT
1
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