diff --git a/doc_src/python_docs_theme/static/pydoctheme.css b/doc_src/python_docs_theme/static/pydoctheme.css
index 30100c639..e8929cab0 100644
--- a/doc_src/python_docs_theme/static/pydoctheme.css
+++ b/doc_src/python_docs_theme/static/pydoctheme.css
@@ -19,6 +19,8 @@ div#fmain {
     -webkit-box-shadow: 0 0 1px 1px #333;
     box-shadow: 0 0 5px 1px #333;
     width: 85%;
+    /* This is super-cheesy, but 1270px is the maximum width of the sidebar, the content and the margins */
+    max-width: 1270px;
 }
 
 div.related {