@tindtechnologies/universalviewer/dist/cjs/content-handlers/iiif/modules/uv-ebookcenterpanel-module/css/styles.less

The Universal Viewer is a community-developed open source project on a mission to help you share your 📚📜📰📽️📻🗿 with the 🌎

.uv-iiif-extension-host.uv-ebook-extension {
  .centerPanel {
    background-color: #fff;

    uv-ebook-reader {
      --reader-spinner-color: #bdbdbd;
      --reader-arrow-color: #e2e2e2;
      --reader-arrow-hover-color: #777;
    }
  }
}