美化 PDF 浏览页面

关键词： pdf.js theme。

相关链接：

• Themes & Skins for pdf.js #3528
• Third party viewer usage
• PDF.js should be themeable.
• https://peerlibrary.org/p/2uX4z4P2nGGwLQTNt/structural-adaptation-via-l_p-norm-oracle-inequalities
• [Changing themes & colors using JavaScript](Changing themes & colors using JavaScript)