diff --git a/doc/source/conf.py b/doc/source/conf.py
index 2f9ccd1..3290f54 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -17,7 +17,9 @@
 
     # convert doxygen to sphinx, source and build directory need
     # to follow https://boschglobal.github.io/doxysphinx/docs/getting_started.html#build
-    subprocess.run(f"doxysphinx build . $READTHEDOCS_OUTPUT/html {doxyfile}", shell=True)
+    subprocess.run(
+        f"doxysphinx build . $READTHEDOCS_OUTPUT/html {doxyfile}", shell=True
+    )
 
 # Configuration file for the Sphinx documentation builder.
 #
@@ -36,13 +38,14 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
 
 extensions = [
-    "sphinx_markdown_tables",
-    "sphinx_copybutton",
+    "myst_parser",
     "sphinx.ext.autosectionlabel",
+    "sphinx_copybutton",
+    "sphinx_design",
+    "sphinx_markdown_tables",
     "sphinx_panels",
-    "sphinxcontrib.images",
     "sphinxcontrib.doxylink",
-    "myst_parser",
+    "sphinxcontrib.images",
 ]
 
 templates_path = ["_templates"]
diff --git a/requirements.txt b/requirements.txt
index bdc26d8..336a84a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 doxysphinx
 myst_parser
 sphinx-copybutton
+sphinx-design
 sphinx-markdown-tables
 sphinx-panels
 sphinx-rtd-theme