Changed z-index of .sticky and added bootstrap z-indexes to bornhack.css as a comment

src/static_src/css/bornhack.css

@@ -12,6 +12,37 @@ a, a:active, a:focus {
    outline: none;
 }
 
+/* Z-index */
+/* Bootstrap values
+.dropdown-backdrop {
+  z-index: 990;
+}
+.navbar-static-top,
+.dropdown-menu {
+  z-index: 1000;
+}
+.navbar-fixed-top,
+.navbar-fixed-bottom {
+  z-index: 1030;
+}
+.modal-backdrop {
+  z-index: 1040;
+}
+.modal {
+  z-index: 1050;
+}
+.popover {
+  z-index: 1060;
+}
+.tooltip {
+  z-index: 1070;
+}
+ */
+/* Custom */
+.sticky {
+  z-index: 980;
+}
+
 @media (max-width: 520px) {
   #main {
     width: 100%;
@@ -236,7 +267,6 @@ footer {
 .sticky {
   position: sticky;
   background-color: #fff;
-  z-index: 9999;
 }
 
 #daypicker {