diff --git a/assets/stylesheets/common.css.sass b/assets/stylesheets/common.css.sass
index c919735..3825d2c 100644
--- a/assets/stylesheets/common.css.sass
+++ b/assets/stylesheets/common.css.sass
@@ -1,4 +1,4 @@
-*
+*, *:before, *:after
   @include box-sizing(border-box)
 
 body