details styles

css/components/islandora_mods.css

@@ -505,7 +505,26 @@ form#views-exposed-form-newspapers-view-block-1 div#edit-actions {
 .field--name-field-abstract .field__item p {
   font-family: var(--font-sans);
 }
+.field--name-field-contributor-details summary::before {
+  content: "▶";
+  display: inline-block;
+  margin-right: 0.5em;
+}
 
+.field--name-field-contributor-details details[open] summary::before {
+  content: "▶";
+  transform: rotate(90deg);
+}
+summary.about.button::before {
+  content: "▶";
+  display: inline-block;
+  margin-right: 0.5em;
+}
+
+details[open] summary.about.button::before {
+  content: "▶";
+  transform: rotate(90deg);
+}
 /* ============================================================
    CITATION / BIBLIOGRAPHY
    ============================================================ */