anchor.diff:  [source,css]
   .src/app/my-project.component.css
   ----
  -paper-toolbar {
  -  background: var(--paper-teal-500);
  -  color: var(--paper-yellow-500);
  +paper-input,
  +vaadin-combo-box {
  +  background: var(--paper-grey-200);
  +  padding: 8px;
   }
   ----
   
  
positive.code: ----
  
  Finally, you can use Polymer custom CSS properties and custom CSS mixins either: in the [filename]#my-project.component.ts# file for the scoped styles, or in the [filename]#index.html# file for the global ones.
  
  [source,html]
  .src/index.html
  
negative.code: }
  ----
  
  Now, you can install all the Polymer elements that you need in your application.
  
  For instance, to install all the elements in the https://elements.polymer-project.org/browse?package=paper-elements[Polymer Paper] collection, and the [elementname]#https://vaadin.com/elements/-/element/vaadin-combo-box[vaadin-combo-box]# element, run the following:
  
  [subs="normal"]
  ----
  [prompt]#$# [command]#bower# install --save [replaceable]#paper-elements vaadin-combo-box#
  ----
  
  