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.

You can't link directly to the public directory in ember because of the way that directory is treated in the build process. I deleted the public directory from my URL and it worked.

 jsTreeConfig: {
    themes: {
      name: 'my-theme',
      url: '../../my-theme/style.css',
    },
  },