diff --git a/config/en/mkdocs.yaml b/config/en/mkdocs.yaml
index db29243..361adb3 100755
--- a/config/en/mkdocs.yaml
+++ b/config/en/mkdocs.yaml
@@ -41,9 +41,6 @@ markdown_extensions:
   - pymdownx.details
   - pymdownx.superfences
 
-extra_css:
-  - stylesheets/extra.css
-
 extra_javascript:
   - javascripts/mathjax.js
   - https://polyfill.io/v3/polyfill.min.js?features=es6
diff --git a/config/nl/mkdocs.yaml b/config/nl/mkdocs.yaml
index 496b7a9..3ec53cb 100755
--- a/config/nl/mkdocs.yaml
+++ b/config/nl/mkdocs.yaml
@@ -41,9 +41,6 @@ markdown_extensions:
   - pymdownx.details
   - pymdownx.superfences
 
-extra_css:
-  - stylesheets/extra.css
-
 extra_javascript:
   - javascripts/mathjax.js
   - https://polyfill.io/v3/polyfill.min.js?features=es6
diff --git a/docs/stylesheets/extra.css b/docs/stylesheets/extra.css
deleted file mode 100644
index 19b062b..0000000
--- a/docs/stylesheets/extra.css
+++ /dev/null
@@ -1,3 +0,0 @@
-[data-md-color-scheme="slate"] {
-  --md-hue: 360; 
-}
\ No newline at end of file