diff --git a/themes/vue/source/css/_style-guide.styl b/themes/vue/source/css/_style-guide.styl
index cffdb6c069..7f6b2b81e4 100644
--- a/themes/vue/source/css/_style-guide.styl
+++ b/themes/vue/source/css/_style-guide.styl
@@ -35,6 +35,7 @@ $style-guide-priority-d-color = white
   details, .style-enforcement
     background-color #eee
   details
+    display block // Add the correct display in IE and Edge.
     position relative
     &:not([open]) summary
       &::after