Implementing a custom theme with ember-cli-jstree?

I'm trying to make my own theme for jstree by way of ember-cli-jstree. I thought I would start by using the proton theme. I copied the proton directory from this link into my public directory in my app and added the name of the theme to my jsconfig blob in my controller:

  jsTreeConfig: {
    themes: {
      name: 'proton',
      dots: false,
      icons: false,
      variant: 'large',
    },
  },

However, this causes the styles to break completely. I haven't found great documentation for creating a custom theme using the ember-cli-jstree addon so any pointers in the right direction there would be helpful.