From 6eb0c5bffd4db9fd5d91182a4b19437b67251b6e Mon Sep 17 00:00:00 2001
From: Joshua Killen <45966243+joshua-killen@users.noreply.github.com>
Date: Fri, 17 Apr 2020 11:41:39 +0100
Subject: [PATCH] Update osi_model.css

---
 osi_model/osi_model_assets/osi_model.css | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/osi_model/osi_model_assets/osi_model.css b/osi_model/osi_model_assets/osi_model.css
index 8d59e91..143512a 100644
--- a/osi_model/osi_model_assets/osi_model.css
+++ b/osi_model/osi_model_assets/osi_model.css
@@ -9,6 +9,10 @@
 }
 
 summary {
-    list-style-type: none;
+    list-style-type: "+";
     cursor: pointer;
+}
+
+details[open] summary {
+    list-style-type: "-";
 }
\ No newline at end of file