ShadowBan

#config/environments/development.rb

Rails.application.assets.logger = Logger.new('/dev/null')

Rails::Rack::Logger.class_eval do
  def call_with_quiet_assets(env)
    previous_level = Rails.logger.level
    Rails.logger.level = Logger::ERROR if env['PATH_INFO'] =~ %r{^/assets/}
    call_without_quiet_assets(env)
  ensure

ShadowBan

<link rel="import" href="/bower_components/iron-list/iron-list.html">
<link rel="import" href="/bower_components/iron-form/iron-form.html">
<link rel="import" href="/bower_components/paper-input/paper-input.html">
<link rel="import" href="/bower_components/paper-button/paper-button.html">
<link rel="import" href="/bower_components/firebase-element/firebase.html">
<link rel="import" href="/bower_components/firebase-element/firebase-collection.html">

<dom-module id="categories-list">
    <style>
      :host {

ShadowBan

<link rel="import" href="../polymer/polymer.html">
<!-- adding these here does nothing -->
<!-- <link rel="import" href="../paper-styles/paper-styles.html">
<link rel="import" href="../polymer-themes/ice.html"> -->

<dom-module id="my-element">
  <style>
   paper-button{
    background-color: var(--default-primary-color);
    color: #fff;