diff --git a/doc/api_assets/style.css b/doc/api_assets/style.css
index 3be4c88f960d86..f03753d09bf66f 100644
--- a/doc/api_assets/style.css
+++ b/doc/api_assets/style.css
@@ -356,7 +356,7 @@ span.type {
 
 #column1.interior {
   width: 702px;
-  border-left: 13em solid #f2f5f0;
+  border-left: 234px solid #f2f5f0;
   padding-left: 2.0em;
 }