diff --git a/style.css b/style.css
index 25cc549c..5d53248c 100644
--- a/style.css
+++ b/style.css
@@ -2680,6 +2680,18 @@
     margin-right: auto !important;
   }
 
+  /* API endpoint pages (frontmatter `openapi:`) render a sticky request/response
+     code rail (#content-side-layout, ~28rem) as a flex sibling to the right of
+     the content column. Our viewport-based centering above pushes the column
+     rightward past ~1650px and overruns that rail. Keep the same 820px column,
+     but center it within its own flex track instead of the viewport so it never
+     crosses into the rail. Scoped by path (covers all locales); the plain API
+     pages (Introduction/Rate Limits/Error Codes) are unaffected. */
+  html[data-current-path*="/api-reference/endpoint/"] #content-area {
+    margin-left: auto !important;
+    margin-right: auto !important;
+  }
+
   /* Taller top navigation bar.
      Mintlify sets the navbar content row to h-12 (48px) with items-center, and
      paints the bottom border on an absolute h-full background layer. Growing the