Bump up custom select menu z-index

Author: rawilk

resources/css/custom-select.css

@@ -77,7 +77,7 @@
     .custom-select__menu {
         @apply absolute
         mt-2
-        z-10
+        z-[--custom-select-menu-z-index]
         origin-top-right
         max-w-full
         w-full

resources/css/variables.css

@@ -53,6 +53,7 @@
     --custom-select-selected-icon-color: theme('colors.green.500');
     --custom-select-selected-icon-hover-color: theme('colors.green.600');
     --custom-select-search-border-color: theme('colors.slate.300');
+    --custom-select-menu-z-index: 30;
 
     --custom-select-dark-menu-color: theme('colors.slate.400');
     --custom-select-dark-menu-bg: theme('colors.slate.700');