diff --git a/sp.css b/sp.css
index 8f7e8f1..2b1e5b0 100644
--- a/sp.css
+++ b/sp.css
@@ -8,7 +8,7 @@ body {
 }
 h1, h2, h3, h4, h5, h6 {
   margin: 1em 0 0.5em 0;
-  line-height: 1.2em;
+  line-height: 1.2;
 }
 a:link, a:visited {
   color: #03c;