diff --git a/themes/index.styl b/themes/index.styl
index a0c7405..ed70239 100644
--- a/themes/index.styl
+++ b/themes/index.styl
@@ -1,3 +1,6 @@
+flex-version = flex
+vendor-prefixes = official
+
 @require 'default'
 @require 'bootstrap3'
-@require 'material'
\ No newline at end of file
+@require 'material'