tweak font weights

Author: sysrich

css/main.css

@@ -1,5 +1,5 @@
 @import url("pygment_highlights.css");
-@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:200,300,400,600,800);
+@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:200,300,400,400italic,600,700,800,900);
 @import url(//fonts.googleapis.com/css?family=Open+Sans:800);
 
 /* --- General --- */