diff --git a/frontend/vendor/flatpickr.css b/frontend/vendor/flatpickr.css
index 64e91f696..ffab7ba7e 100644
--- a/frontend/vendor/flatpickr.css
+++ b/frontend/vendor/flatpickr.css
@@ -1,3 +1,18 @@
+/*
+  custom code
+  hides the up/down arrows in time (number) inputs
+*/
+/* webkit */
+.flatpickr-calendar input[type=number]::-webkit-inner-spin-button,
+.flatpickr-calendar input[type=number]::-webkit-outer-spin-button {
+  -webkit-appearance: none;
+  margin: 0;
+}
+/* firefox */
+.flatpickr-calendar input[type=number] {
+  -moz-appearance:textfield;
+}
+/* vendor code */
 .flatpickr-calendar {
   background: transparent;
   opacity: 0;