diff --git a/sass/css/_base.scss b/sass/css/_base.scss
index 587d0e6..92ade04 100644
--- a/sass/css/_base.scss
+++ b/sass/css/_base.scss
@@ -215,4 +215,8 @@ ul:not(.navbar-nav) li {
 
 [data-popup] {
   cursor: pointer;
+}
+
+a[aria-expanded='true']:after {
+  transform: rotate(-180deg);
 }
\ No newline at end of file