안녕하세요[ 여기서 버튼을 넣어서 누르면 버튼에 따라서 보이는 화면이 다르게 만들고 싶은데 무슨 문제가 있는지 버튼을 만들어서 이벤트를넣어줘도 버튼은 보이는데 그 버튼이 클릭이 안되네요 도움점 부탁드립니다.

//여기에 코드를 입력하세요
<!-- START SIGMA IMPORTS -->
<script src="../src/sigma.core.js"></script>
<script src="../src/conrad.js"></script>
<script src="../src/utils/sigma.utils.js"></script>
<script src="../src/utils/sigma.polyfills.js"></script>
<script src="../src/sigma.settings.js"></script>
<script src="../src/classes/sigma.classes.dispatcher.js"></script>
<script src="../src/classes/sigma.classes.configurable.js"></script>
<script src="../src/classes/sigma.classes.graph.js"></script>
<script src="../src/classes/sigma.classes.camera.js"></script>
<script src="../src/classes/sigma.classes.quad.js"></script>
<script src="../src/classes/sigma.classes.edgequad.js"></script>
<script src="../src/captors/sigma.captors.mouse.js"></script>
<script src="../src/captors/sigma.captors.touch.js"></script>
<script src="../src/renderers/sigma.renderers.canvas.js"></script>
<script src="../src/renderers/sigma.renderers.webgl.js"></script>
<script src="../src/renderers/sigma.renderers.svg.js"></script>
<script src="../src/renderers/sigma.renderers.def.js"></script>
<script src="../src/renderers/webgl/sigma.webgl.nodes.def.js"></script>
<script src="../src/renderers/webgl/sigma.webgl.nodes.fast.js"></script>
<script src="../src/renderers/webgl/sigma.webgl.edges.def.js"></script>
<script src="../src/renderers/webgl/sigma.webgl.edges.fast.js"></script>
<script src="../src/renderers/webgl/sigma.webgl.edges.arrow.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.labels.def.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.hovers.def.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.nodes.def.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edges.def.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edges.curve.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edges.arrow.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edges.curvedArrow.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edgehovers.def.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edgehovers.curve.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edgehovers.arrow.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.edgehovers.curvedArrow.js"></script>
<script src="../src/renderers/canvas/sigma.canvas.extremities.def.js"></script>
<script src="../src/renderers/svg/sigma.svg.utils.js"></script>
<script src="../src/renderers/svg/sigma.svg.nodes.def.js"></script>
<script src="../src/renderers/svg/sigma.svg.edges.def.js"></script>
<script src="../src/renderers/svg/sigma.svg.edges.curve.js"></script>
<script src="../src/renderers/svg/sigma.svg.labels.def.js"></script>
<script src="../src/renderers/svg/sigma.svg.hovers.def.js"></script>
<script src="../src/middlewares/sigma.middlewares.rescale.js"></script>
<script src="../src/middlewares/sigma.middlewares.copy.js"></script>
<script src="../src/misc/sigma.misc.animation.js"></script>
<script src="../src/misc/sigma.misc.bindEvents.js"></script>
<script src="../src/misc/sigma.misc.bindDOMEvents.js"></script>
<script src="../src/misc/sigma.misc.drawHovers.js"></script>
<!-- END SIGMA IMPORTS -->
<div id="container">
  <style>
    #graph-container {
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
      position: absolute;
    }
  </style>
  <div id="graph-container"></div>
</div>
<script>
/**
 * This is a basic example on how to instantiate sigma. A random graph is
 * generated and stored in the "graph" variable, and then sigma is instantiated
 * directly with the graph.
 *
 * The simple instance of sigma is enough to make it render the graph on the on
 * the screen, since the graph is given directly to the constructor.
 */
var i,
    s,
    N = 100,
    E = 500,
    g = {
      nodes: [],
      edges: []
    };

// Generate a random graph:
for (i = 0; i < N; i++)
  g.nodes.push({
    id: 'n' + i,
    label: 'Node ' + i,
    x: Math.random(),
    y: Math.random(),
    size: Math.random(),
    color: '#666'
  });

for (i = 0; i < E; i++)
  g.edges.push({
    id: 'e' + i,
    source: 'n' + (Math.random() * N | 0),
    target: 'n' + (Math.random() * N | 0),
    size: Math.random(),
    color: '#ccc'
  });

// Instantiate sigma:
s = new sigma({
  graph: g,
  container: 'graph-container'
});
</script>