visjs-options.js

  var options = {
    nodes: {
      shape: "dot",
      scaling: {
        customScalingFunction: function(min, max, total, value) {
          return value / total;
        },
        min: 5,
        max: 150
      }
    },
    edges: {
      color: {
        color: 'gray',
        opacity: 0.5
      }
    }
  };