diff --git a/lib/rdoc/generator/template/rails/resources/css/main.css b/lib/rdoc/generator/template/rails/resources/css/main.css
index d1e95bca..cd95cf7d 100644
--- a/lib/rdoc/generator/template/rails/resources/css/main.css
+++ b/lib/rdoc/generator/template/rails/resources/css/main.css
@@ -221,6 +221,8 @@ html {
 .banner {
   height: var(--banner-height);
   background-color: var(--brand-color);
+  position: fixed;
+  width: inherit;
 }
 
 .banner__segment {