Restore optgroup font normalisation (#589)

slavanga · Jonathan Neal · commit 02af1fdfaf71 · 2016-04-17T21:45:24.000-04:00
Resolves #581
diff --git a/normalize.css b/normalize.css
@@ -256,6 +256,7 @@ hr {
 
 button,
 input,
+optgroup,
 select,
 textarea {
   font: inherit; /* 1 */
