diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8aad5fdd..071998ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-This extended repository tracks the master branch [sphinx-book-theme] (https://github.com/executablebooks/sphinx-book-theme).  The most recent commit of the master incorporated is [8822eef](https://github.com/executablebooks/sphinx-book-theme/commit/8822eeff673f14e627925a51070d5eeaf3360dbe)
+This extended repository tracks the master branch [sphinx-book-theme] (https://github.com/executablebooks/sphinx-book-theme).  The most recent commit of the master incorporated is [f76b6c3](https://github.com/executablebooks/sphinx-book-theme/commit/f76b6c3957f4beb105555e319d9e662755d17c95)
 
 ## The following files have been added:
 
diff --git a/pyproject.toml b/pyproject.toml
index bfcd5613..3d67b982 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,8 @@ filterwarnings = [
   # Sphinx triggers this
   '''ignore:'imghdr' is deprecated and slated for removal in Python 3\.13:DeprecationWarning''',
   '''ignore:'sphinx.util.import_object' is deprecated.:PendingDeprecationWarning''',
-  'ignore:Parsing dates involving a day of month without a year specified is ambiguious:DeprecationWarning'
+  'ignore:Parsing dates involving a day of month without a year specified is ambiguious:DeprecationWarning',
+  'ignore:Argument "parser_name" will be removed in Docutils 2.0.:PendingDeprecationWarning',
 ]
 
 
diff --git a/src/sphinx_book_theme/assets/styles/sections/_sidebar-primary.scss b/src/sphinx_book_theme/assets/styles/sections/_sidebar-primary.scss
index f446759f..ba026a3c 100644
--- a/src/sphinx_book_theme/assets/styles/sections/_sidebar-primary.scss
+++ b/src/sphinx_book_theme/assets/styles/sections/_sidebar-primary.scss
@@ -18,6 +18,15 @@
     opacity variables.$animation-time ease 0s,
     visibility variables.$animation-time ease 0s;
 
+  // Hide sidebar when toggle button is clicked on wide screens
+  &.pst-sidebar-hidden {
+    @media (min-width: variables.$breakpoint-lg) {
+      margin-left: -(variables.$sidebar-primary-width-widescreen);
+      visibility: hidden;
+      opacity: 0;
+    }
+  }
+
   @media (max-width: variables.$breakpoint-md) {
     // So that tooltips don't overlap
     z-index: variables.$zindex-tooltip + 1;
@@ -28,6 +37,13 @@
     border-top: none;
   }
 
+  // Left-align icon badges with standard gap spacing instead of centering
+  .navbar-icon-links {
+    display: flex !important;
+    justify-content: flex-start !important;
+    gap: 0.5rem !important;
+  }
+
   // On wide screens we have a smaller sidebar width than PST
   @media (min-width: variables.$breakpoint-lg) {
     flex-basis: variables.$sidebar-primary-width-widescreen;
diff --git a/src/sphinx_book_theme/header_buttons/__init__.py b/src/sphinx_book_theme/header_buttons/__init__.py
index 86ed39fb..286492af 100644
--- a/src/sphinx_book_theme/header_buttons/__init__.py
+++ b/src/sphinx_book_theme/header_buttons/__init__.py
@@ -117,6 +117,7 @@ def add_header_buttons(app, pagename, templatename, context, doctree):
                 "tooltip": translation("Fullscreen mode"),
                 "icon": "fas fa-expand",
                 "label": "fullscreen-button",
+                "classes": "pst-navbar-icon",
             }
         )
 
diff --git a/src/sphinx_book_theme/header_buttons/launch.py b/src/sphinx_book_theme/header_buttons/launch.py
index 3ab773ea..48b6b5ce 100644
--- a/src/sphinx_book_theme/header_buttons/launch.py
+++ b/src/sphinx_book_theme/header_buttons/launch.py
@@ -54,6 +54,7 @@ def add_launch_buttons(
                 "jupyterhub_url", 
                 "thebe", 
                 "colab_url", 
+                "jupyterlite_url",
                 "use_lite_button", 
                 "use_reveal_button", 
                 "use_powerpoint_button", 
@@ -123,6 +124,9 @@ def add_launch_buttons(
     binderhub_url = launch_buttons.get("binderhub_url", "").strip("/")
     colab_url = launch_buttons.get("colab_url", "").strip("/")
     deepnote_url = launch_buttons.get("deepnote_url", "").strip("/")
+    # jupyterlite_url could be absolute but without a domain, so we only
+    # strip trailing slashes, not leading ones
+    jupyterlite_url = launch_buttons.get("jupyterlite_url", "").rstrip("/")
     lightning_studios_url = launch_buttons.get("lightning_studios_url", "").strip("/")
 
     # Loop through each provider and add a button for it if needed
@@ -211,6 +215,19 @@ def add_launch_buttons(
                     "url": url,
                 }
             )
+    if jupyterlite_url:
+        jl_ext = launch_buttons.get("jupyterlite_ext", extension).strip()
+        jl_rel_repo = f"{book_relpath}{pagename}{jl_ext}"
+        url = f"{jupyterlite_url}?path={jl_rel_repo}"
+        launch_buttons_list.append(
+            {
+                "type": "link",
+                "text": "JupyterLite",
+                "tooltip": "Launch via JupyterLite",
+                "icon": "_static/images/logo_jupyterlite.svg",
+                "url": url,
+            }
+        )
     # Add thebe flag in context
     if launch_buttons.get("thebe", False):
         launch_buttons_list.append(