diff --git a/styles/core/_variables.scss b/styles/core/_variables.scss
index 44fc53c8..122739c4 100644
--- a/styles/core/_variables.scss
+++ b/styles/core/_variables.scss
@@ -33,7 +33,7 @@ $title-font-size: 5.2rem;
 $h1-font-size: 4rem;
 $h2-font-size: 3rem;
 $h3-font-size: 2.3rem;
-$h4-font-size: 1.7rem;
+$h4-font-size: 1.9rem;
 $h5-font-size: 1.5rem;
 $h6-font-size: 1.3rem;
 $base-line-height: 1.5;
@@ -44,6 +44,7 @@ $font-sans: "Source Sans Pro", sans-serif;
 $font-serif: "Merriweather", serif;
 
 $font-normal: 400;
+$font-semibold: 600;
 $font-bold: 700;
 
 // Color