The Bibliothèque Sainte-Barbe, part of Sorbonne Nouvelle, did kindly agree to share their CSS. Results here.

/* White background */
md-content, md-content.md-primoExplore-theme {
background-color: white;
}

/* Black text for advanced search */
zero-margin md-primoExplore-theme layout-align-start-center layout-row md-input-has-value {
color: #000;
}

/* Header*/
#prm-secondary-color, prm-search-bookmark-filter .md-button, prm-topbar .top-nav-bar {
background-color: white;
}

/* text-transform: uppercase; = changed to ‘none’ */
.md-button {
color: currentColor;
line-height: 36px;
white-space: nowrap;
text-align: center;
text-transform: none;
font-weight: 500;
font-style: inherit;
font-variant: inherit;
font-family: inherit;
cursor: pointer;
}

/* Full title view*/
/* border in purple */
/* add !important if also Rapido tile should look like this */
.full-view-section prm-full-view-service-container {
border-radius: 0px;
border-top: solid 1px #CDB8FF ;
border-left: 0px ;
border-right: 0px ;
border-bottom: 0px ;
}

/* divider in purple */
.full-view-section .section-title {
color: #6829ff;
padding: 6px 0px 6px;
padding-right: 1em;
margin-right: 7px;
vertical-align: top;
font-size: 1.4em;
margin: 0;
margin-right: 0px;
}

/* Rapido tile and get it – sadly the same code */
#getit_link1_0>div>prm-full-view-service-container,
#getit_link1_1>div>prm-full-view-service-container,
#rapidoOffer>div>prm-full-view-service-container {
border-radius: 0px;
border-top: solid 1px #CDB8FF ;
border-left: solid 1px #e9e9e9;
border-right: solid 1px #e9e9e9;
border-bottom: solid 1px #e9e9e9;
}

/* hide grey banner next to the font */
#full-view-container md-divider.md-primoExplore-theme {
opacity: 0;
}

prm-action-list>md-nav-bar .md-nav-item .md-button {
margin: auto;
}

/* Heading ‘Locations for related titles‘, purple, not upper case */
h4.subsection-title {
color: #6829ff;
padding: 26px 0px 6px;
margin-right: 7px;
vertical-align: top;
font-size: 1.2em !important;
font-weight: 300 !important;
margin: 0;
margin-right: 0px;
text-transform: none !important ;
}

/* dark grey */
.light-text, prm-search-result-list .results-footer, prm-search-result-list .results-header {
font-weight: 300;
color: #535353;
}

/* whit background; deleted second semicolon at the end */
.__sm .prm-hue2.sidebar, .__sm prm-facet.prm-hue2, .__sm prm-full-view-cont .recommendations-title::after, .__sm prm-full-view-cont .recommendations-title prm-icon, .__sm prm-full-view-cont .recommendations-wrapper, .__xs .prm-hue2.sidebar, .__xs prm-facet.prm-hue2, .__xs prm-full-view-cont .recommendations-title::after, .__xs prm-full-view-cont .recommendations-title prm-icon, .__xs prm-full-view-cont .recommendations-wrapper, .available-facets .section-content .md-chips .md-chip .prm-hue2.md-button::before, .full-view-inner-container, .line-clamp-1::after, .line-clamp-2::after, .line-clamp-3::after, .line-clamp-4::after, .line-clamp-5::after, .list-item-wrapper, .multiselect-submit .prm-hue2.multiselect-submit-inner, .prm-background.prm-hue2, .prm-full-view-dialog, .prm-horizontal-content .horizontal-content-item md-card > .md-button, .prm-hue2.prm-view-overlay-inner, .recommendations-title::after, .recommendations-title prm-icon, .tiles-grid-tile, .tiles-grid-tile .tile-content prm-spinner.overlay-cover::after, .tiles-grid-tile md-list prm-spinner.overlay-cover::after, body.prm-hue2, databases .prm-hue2.sticking-wrapper, html.prm-hue2, md-card.default-card, md-card .prm-hue2.card-content-block, md-dialog md-toolbar.prm-hue2:not(.md-menu-toolbar), md-grid-tile, md-grid-tile .tile-content prm-spinner.overlay-cover::after, md-grid-tile md-list prm-spinner.overlay-cover::after, md-list.prm-list.prm-linkable-list-items md-list-item ._md-list-item-inner, md-virtual-repeat-container#prm-simple-search .md-autocomplete-suggestions md-divider.prm-hue2, prm-atoz-search-bar .advanced-search-output md-card, prm-atoz-search-bar .advanced-search-tabs, prm-atoz-search-bar .simple-search-wrapper .prm-hue2.search-options::after, prm-atoz-search-bar .simple-search-wrapper .search-options md-divider.prm-hue2, prm-browse-search-bar .advanced-search-output md-card, prm-browse-search-bar .advanced-search-tabs, prm-browse-search-bar .simple-search-wrapper .prm-hue2.search-options::after, prm-browse-search-bar .simple-search-wrapper .search-options md-divider.prm-hue2, prm-browse-search md-list.prm-list.prm-linkable-list-items md-list-item ._md-list-item-inner, prm-featured-result-item md-card, prm-featured-result-item md-card md-card-title, prm-featured-results .horizontal-content-container .prm-hue2.horizontal-content-control, prm-full-view-cont .prm-hue2.recommendations-title::after, prm-full-view-cont .recommendations-title prm-icon.prm-hue2, prm-full-view-cont prm-recomendation-item .media-on-hover .prm-hue2.pin-button, prm-gallery-collection .collection-folder, prm-gallery-collection .collection-folder .item-meta, prm-gallery-collection .collection-folder h3 span, prm-gallery-item .collection-element, prm-gallery-item .collection-element .item-title, prm-gallery-item .collection-element .resource-type, prm-newspapers-search-bar .advanced-search-output md-card, prm-newspapers-search-bar .advanced-search-tabs, prm-newspapers-search-bar .simple-search-wrapper .prm-hue2.search-options::after, prm-newspapers-search-bar .simple-search-wrapper .search-options md-divider.prm-hue2, prm-recomendation-item .media-on-hover .pin-button, prm-recomendation-item .media-on-hover .pin-button:hover, prm-resource-recommender md-card, prm-search-bar .advanced-search-output md-card, prm-search-bar .advanced-search-tabs, prm-search-bar .simple-search-wrapper .prm-hue2.search-options::after, prm-search-bar .simple-search-wrapper .search-options md-divider.prm-hue2, prm-search-result-list .results-footer, prm-search-result-list .results-header, prm-search .prm-hue2.ui-blocker, prm-tags-results-list md-list.prm-list.prm-linkable-list-items md-list-item ._md-list-item-inner, prm-tags-search-bar .advanced-search-output md-card, prm-tags-search-bar .advanced-search-tabs, prm-tags-search-bar .simple-search-wrapper .prm-hue2.search-options::after, prm-tags-search-bar .simple-search-wrapper .search-options md-divider.prm-hue2 {
background-color: #ffffff;
}

#brief prm-full-view-service-container .section-body prm-brief-result-container .result-item-actions.layout-row .md-button.md-icon-button {
margin-right: 80px;
}

/* Hide the small navigation menu in the full title display */
prm-full-view .services-index-under #services-index {
max-width: 125px;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
display: none;
}

4.1.2023