style: highlight only 1 item on the sidebar

packages/docusaurus-playground/docs/Advanced/pages/index.md

@@ -0,0 +1,10 @@
+---
+title: Subpage Group
+sidebar_position: 5
+---
+
+## Hello World
+
+```python
+print("hello world!")
+```

packages/docusaurus-playground/docs/Advanced/pages/subpage2.md

@@ -0,0 +1,10 @@
+---
+title: Subpage2
+sidebar_position: 5
+---
+
+## Hello World
+
+```python
+print("hello world!")
+```

packages/docusaurus-playground/docs/Advanced/pages/subpage3.md

@@ -0,0 +1,10 @@
+---
+title: Subpage3
+sidebar_position: 6
+---
+
+## Hello World
+
+```python
+print("hello world!")
+```

packages/docusaurus-playground/docs/Advanced/subpage1.md

@@ -1,5 +1,5 @@
 ---
-title: Subtitle
+title: Subpage1
 sidebar_position: 4
 ---
 

packages/docusaurus-playground/docs/Advanced/subpage4.md

@@ -0,0 +1,10 @@
+---
+title: Subpage4
+sidebar_position: 7
+---
+
+## Hello World
+
+```python
+print("hello world!")
+```

packages/logos-docusaurus-theme/src/client/css/custom.scss

@@ -731,6 +731,14 @@ table {
   transform: rotate(180deg);
 }
 
+.menu__list-item-collapsible--active > :not(a[href='#']) {
+  box-shadow: inset 1px 0px 0px rgb(var(--lsd-border-primary));
+}
+
+.menu__list-item-collapsible > a {
+  box-shadow: none;
+}
+
 main[itemtype*='Blog'] {
   margin-left: 0;