diff --git a/packages/docusaurus-theme-classic/src/theme/DocPage/Layout/styles.module.css b/packages/docusaurus-theme-classic/src/theme/DocPage/Layout/styles.module.css
index 03c6f2194b09..3cc2c95bdd7f 100644
--- a/packages/docusaurus-theme-classic/src/theme/DocPage/Layout/styles.module.css
+++ b/packages/docusaurus-theme-classic/src/theme/DocPage/Layout/styles.module.css
@@ -8,6 +8,7 @@
 .docPage {
   display: flex;
   width: 100%;
+  flex: 1 0;
 }
 
 .docsWrapper {