plugin.xml

<!DOCTYPE plugin SYSTEM "../plugin.dtd">

<plugin
  class="ro.sync.exml.plugin.Plugin"
  id="custom-ui-style-plugin"
  name="Load CSS to affect the user interface"
  description="Loads a custom CSS to affect the user interface."
  version="1.0"
  vendor="Syncro Soft">

    <!-- Web Author will serve the content of the `web/static/` folder
              at `WEB_AUTHOR_URL/plugin-resources/custom-ui-style-plugin/` -->
    <extension type="WebappStaticResourcesFolder" path="web/static" href="custom-ui-style-plugin"/>
</plugin>