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3rd/CLI11/docs/doxygen-custom.css

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+/* CLI11 tweaks on top of doxygen-awesome (sidebar-only layout). */
+
+/* doxygen-awesome hides the sidebar expander arrows until hover, which makes
+   collapsed sections (Guide, Examples, API Reference) easy to miss. Keep them
+   visible. */
+html {
+  --side-nav-arrow-opacity: 0.4;
+  --side-nav-arrow-hover-opacity: 0.9;
+
+  /* The theme reserves --top-height for the sidebar header (title + search).
+     Its 120px default is a few pixels too short for our logo + two-line brief,
+     which clips the bottom of the search bar. */
+  --top-height: 140px;
+}
+
+/* The sidebar header already shows the project name, so the always-expanded
+   "CLI11" root node in the navtree is redundant. Hide its row and shift the
+   remaining rows left one indent level (the tree indents 16px per level with
+   inline padding, so a fixed negative margin promotes every row equally). */
+#nav-tree-contents > ul > li > div.item {
+  display: none;
+}
+
+#nav-tree-contents ul.children_ul .arrow {
+  margin-left: -16px;
+}
+
+/* Place the dark-mode toggle in the top-right corner of the sidebar header. */
+#titlearea {
+  position: relative;
+}
+
+doxygen-awesome-dark-mode-toggle {
+  position: absolute;
+  top: 2px;
+  right: 8px;
+}