Add rule for all headings lh (#596)

jeremenichelli · Jonathan Neal · commit ceef420f3a24 · 2016-06-16T10:04:06.000-04:00
diff --git a/normalize.css b/normalize.css
@@ -154,6 +154,20 @@ h1 {
   margin: 0.67em 0;
 }
 
+/**
+ * Correct the line-height for all headings in Chrome mobile, Firefox,
+ * iOS Safari, Microsoft Edge and IE.
+ */
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  line-height: 1.15;
+}
+
 /**
  * Add the correct background and color in IE 9-.
  */
