diff --git a/less/core.less b/less/core.less
index 83a9d2a..147d714 100644
--- a/less/core.less
+++ b/less/core.less
@@ -644,7 +644,7 @@ body#collection article, body#subpage article {
 	padding-bottom: 0;
 	.book {
 		h2 {
-			font-size: 1.5;
+			font-size: 1.4em;
 		}
 		a.hidden.action {
 			 color: #666;