fix to z-index of event carousel buttons

Author: TR-04

frontend/src/styles/globals.css

@@ -83,4 +83,8 @@ body {
 .dropdown-item:nth-child(3) { animation-delay: 0.3s; }
 .dropdown-item:nth-child(4) { animation-delay: 0.4s; }
 .dropdown-item:nth-child(5) { animation-delay: 0.5s; }
-.dropdown-item:nth-child(6) { animation-delay: 0.6s; }
+.dropdown-item:nth-child(6) { animation-delay: 0.6s; }
+
+.carousel-container .react-multiple-carousel__arrow {
+  z-index: 5;
+}