diff --git a/src/librustdoc/html/static/rustdoc.css b/src/librustdoc/html/static/rustdoc.css
index 858ef3bf411..b6a342ea3b0 100644
--- a/src/librustdoc/html/static/rustdoc.css
+++ b/src/librustdoc/html/static/rustdoc.css
@@ -274,9 +274,13 @@ nav.sub {
 	border-bottom: 1px solid;
 }
 
-.docblock h1 { font-size: 1.3em; }
-.docblock h2 { font-size: 1.15em; }
-.docblock h3, .docblock h4, .docblock h5 { font-size: 1em; }
+#main > .docblock h1 { font-size: 1.3em; }
+#main > .docblock h2 { font-size: 1.15em; }
+#main > .docblock h3, #main > .docblock h4, #main > .docblock h5 { font-size: 1em; }
+
+.docblock h1 { font-size: 1em; }
+.docblock h2 { font-size: 0.95em; }
+.docblock h3, .docblock h4, .docblock h5 { font-size: 0.9em; }
 
 .docblock {
 	margin-left: 24px;