diff --git a/docs/_static/pmOS.css b/docs/_static/pmOS.css
new file mode 100644
index 00000000..2edc2803
--- /dev/null
+++ b/docs/_static/pmOS.css
@@ -0,0 +1,13 @@
+/* pmOS styling color */
+body {
+  --themecolor: #009900;
+}
+
+/* sets the menu bg color for desktop layout */
+.wy-side-nav-search {
+  background-color: var(--themecolor)
+}
+/* sets the menu bg color for mobile layout */
+.wy-nav-top {
+  background-color: var(--themecolor)
+}
diff --git a/docs/conf.py b/docs/conf.py
index 99cec3d1..ae1dd85f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -65,6 +65,10 @@ html_theme_options = {
     "style_external_links": True,
 }
 
+# customize styling
+html_static_path = ["_static"]
+html_css_files = ["pmOS.css"]
+
 # -- Options for manual page output ---------------------------------------
 
 # One entry per manual page. List of tuples