add accordion support

data/static/style.css

@@ -634,3 +634,48 @@ ul, ol {
   max-width: 15px;
   max-height: 15px;
 }
+
+.accordion {
+  border-top-right-radius: 3px;
+  border-top-left-radius: 3px;
+  box-sizing: border-box;
+  border: 1px solid black;
+  margin: 10px 5px;
+  overflow: hidden;
+}
+
+.accordion.hidden {
+  border-bottom: none;
+}
+
+.accordion-header {
+  display: flex;
+  align-items: center;
+  background-color: rgb(159.0271653543, 162.0727712915, 172.9728346457);
+  padding: 0 10px;
+  gap: 10px;
+  border-bottom: 1px solid black;
+}
+
+.accordion-toggle {
+  padding: 0;
+  width: 36px;
+  height: 36px;
+  min-width: 36px;
+  min-height: 36px;
+}
+
+.accordion-title {
+  margin-right: auto;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.accordion-content {
+  padding: 0 15px;
+}
+
+.accordion-content.hidden {
+  display: none;
+}