diff --git a/app/Resources/public/css/base.css b/app/Resources/public/css/base.css
index 4463cef2ba..f18cf00ca3 100644
--- a/app/Resources/public/css/base.css
+++ b/app/Resources/public/css/base.css
@@ -4495,10 +4495,10 @@ ul.holder li.bit-box{
 #thematic .views ul li{
   font-size: 12px;
 }
-.arrow{
+#thematic .arrow{
     background: url("../../main/img/icons/22/arrow-up-collapse.png") no-repeat 99% center;
 }
-.arrow.collapsed{
+#thematic .arrow.collapsed{
     background: url("../../main/img/icons/22/arrow-down-collapse.png") no-repeat 99% center;
 }
 .question_options .exercise-unique-answer-image .radio{