Drupal 7 theme JS & CSS was located here...
styles https://github.com/duke-libraries/drupal-dulcet/blob/4a10febce7abc344367ccf2eb504b8f5a3dade5d/scss/components/_newadditions.scss
scripts https://github.com/duke-libraries/drupal-dulcet/blob/4a10febce7abc344367ccf2eb504b8f5a3dade5d/assets/js/catalog-new-additions.js