diff --git a/docs/docs/extra.css b/docs/docs/extra.css
new file mode 100644
index 0000000000000000000000000000000000000000..2281f083dd0338b8b89c3bddeb9adcf4a8d46b92
--- /dev/null
+++ b/docs/docs/extra.css
@@ -0,0 +1 @@
+.codehilite {width: 590px;}
diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index e72971290de69c0fb9fcd15bbd2199d219b1cef3..8113103ff942d92c1c4f2ee174d1dcb22630edf6 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -23,6 +23,9 @@ theme:
     name: readthedocs
     highlightjs: true
 
+extra_css:
+  - extra.css
+
 markdown_extensions:
   - admonition
   - codehilite: