diff --git a/src/index.css b/src/index.css
index d1c4760..386fa27 100644
--- a/src/index.css
+++ b/src/index.css
@@ -21,3 +21,8 @@
   border-width: 10px 0 10px 11px;
   margin-top: -10px;
 }
+
+.fc .fc-timegrid-slots {
+  /* Fix timegrid lines rendering over events on iOS 5.1.1 */
+  z-index: 0 !important;
+}