diff --git a/packages/docusaurus-1.x/lib/static/css/main.css b/packages/docusaurus-1.x/lib/static/css/main.css
index e9363f01c719..cdf7320e01e7 100644
--- a/packages/docusaurus-1.x/lib/static/css/main.css
+++ b/packages/docusaurus-1.x/lib/static/css/main.css
@@ -618,7 +618,7 @@ blockquote {
 
 /* Main Container */
 .mainContainer {
-  flex: 1 1 auto;
+  flex: 1 1 0%;
   max-width: 100%;
   padding: 40px 0;
 }