diff --git a/tests/test_prepare_mdbook.py b/tests/test_prepare_mdbook.py
index fec8cf3..ff43ee7 100644
--- a/tests/test_prepare_mdbook.py
+++ b/tests/test_prepare_mdbook.py
@@ -192,7 +192,10 @@ Reference :cite:`smith2024`.
             self.assertIn("padding: 0 !important;", rewritten)
             self.assertIn("border-radius: 6px;", rewritten)
             self.assertIn("background: #f6f8fa;", rewritten)
-            self.assertIn("width: min(100%, max(80%, var(--content-max-width)));", rewritten)
+            self.assertIn(".content main {", rewritten)
+            self.assertIn("max-width: min(100%, max(80%, var(--content-max-width)));", rewritten)
+            self.assertIn(".openmlsys-frontpage {", rewritten)
+            self.assertIn("width: 100%;", rewritten)
             self.assertIn("margin-inline: auto;", rewritten)
 
     def test_regular_page_does_not_render_frontpage_switch(self) -> None:
diff --git a/tools/prepare_mdbook.py b/tools/prepare_mdbook.py
index 2fd9f7d..bbe5a34 100644
--- a/tools/prepare_mdbook.py
+++ b/tools/prepare_mdbook.py
@@ -25,7 +25,7 @@ FRONTPAGE_SWITCH_PLACEHOLDER = "<!-- OPENMLSYS_LANGUAGE_SWITCH -->"
 FRONTPAGE_LAYOUT_CSS = """
 <style>
 .openmlsys-frontpage {
-  width: min(100%, max(80%, var(--content-max-width)));
+  width: 100%;
   margin: 0 auto 3rem;
   margin-inline: auto;
 }
@@ -101,6 +101,9 @@ FRONTPAGE_LAYOUT_CSS = """
   max-width: 960px;
   margin-inline: auto;
 }
+.content main {
+  max-width: min(100%, max(80%, var(--content-max-width)));
+}
 @media (max-width: 1000px) {
   .openmlsys-frontpage .mdl-cell,
   .openmlsys-frontpage .mdl-cell--1-col,