Entity Print Integration to use theme

Problem/Motivation

We have integrated Entity Print with the theme. It works and expands a JQuery UI nested paragraphs content and creates a PDF. However, this PDF is not formatted. We created a print.css as described in another thread.

@media print {}

.views-accordion-item .accordion-content {
    display: block !important;
  }

.d8-fade {
    opacity: 1!important;
  }
.main-navigation-wrapper,
#header,
#welcome-text,
#highlighted,
#top-container,
#footer-container,
#bottom-container,
#footer-menu,
#copyright,
.second-sidebar,
.first-sidebar{
  display: none!important;
 }

.w3css-content p {
    margin: 0;
    color: #000!important;
    background-color: #fff!important;
  }
.links li {
    font-weight: bold!important;
  }

However, none of the theme styles are carried over to the print display. How can we integrate the theme with entity print module?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes