Index: lams_central/web/css/bootstrap/_dropdown.scss
===================================================================
diff -u -rb7c92dbcfdb0469dbc0144190a201757f398e529 -ra90d0744dd0d09d1b04869e61ce1b66bf1ee3242
--- lams_central/web/css/bootstrap/_dropdown.scss	(.../_dropdown.scss)	(revision b7c92dbcfdb0469dbc0144190a201757f398e529)
+++ lams_central/web/css/bootstrap/_dropdown.scss	(.../_dropdown.scss)	(revision a90d0744dd0d09d1b04869e61ce1b66bf1ee3242)
@@ -18,12 +18,13 @@
 // The dropdown menu
 .dropdown-menu {
   // scss-docs-start dropdown-css-vars
+  --#{$prefix}dropdown-zindex: #{$zindex-dropdown};
   --#{$prefix}dropdown-min-width: #{$dropdown-min-width};
   --#{$prefix}dropdown-padding-x: #{$dropdown-padding-x};
   --#{$prefix}dropdown-padding-y: #{$dropdown-padding-y};
   --#{$prefix}dropdown-spacer: #{$dropdown-spacer};
   @include rfs($dropdown-font-size, --#{$prefix}dropdown-font-size);
-  --#{$prefix}dropdown-color: #{$dropdown-color}; // stylelint-disable-line custom-property-empty-line-before
+  --#{$prefix}dropdown-color: #{$dropdown-color};
   --#{$prefix}dropdown-bg: #{$dropdown-bg};
   --#{$prefix}dropdown-border-color: #{$dropdown-border-color};
   --#{$prefix}dropdown-border-radius: #{$dropdown-border-radius};
@@ -46,7 +47,7 @@
   // scss-docs-end dropdown-css-vars
 
   position: absolute;
-  z-index: $zindex-dropdown;
+  z-index: var(--#{$prefix}dropdown-zindex);
   display: none; // none by default, but block on "open" of the menu
   min-width: var(--#{$prefix}dropdown-min-width);
   padding: var(--#{$prefix}dropdown-padding-y) var(--#{$prefix}dropdown-padding-x);
@@ -66,6 +67,18 @@
     left: 0;
     margin-top: var(--#{$prefix}dropdown-spacer);
   }
+
+  @if $dropdown-padding-y == 0 {
+    > .dropdown-item:first-child,
+    > li:first-child .dropdown-item {
+      @include border-top-radius(var(--#{$prefix}dropdown-inner-border-radius));
+    }
+    > .dropdown-item:last-child,
+    > li:last-child .dropdown-item {
+      @include border-bottom-radius(var(--#{$prefix}dropdown-inner-border-radius));
+    }
+
+  }
 }
 
 // scss-docs-start responsive-breakpoints
@@ -172,18 +185,6 @@
   background-color: transparent; // For `<button>`s
   border: 0; // For `<button>`s
 
-  // Prevent dropdown overflow if there's no padding
-  // See https://github.com/twbs/bootstrap/pull/27703
-  @if $dropdown-padding-y == 0 {
-    &:first-child {
-      @include border-top-radius(var(--#{$prefix}dropdown-inner-border-radius));
-    }
-
-    &:last-child {
-      @include border-bottom-radius(var(--#{$prefix}dropdown-inner-border-radius));
-    }
-  }
-
   &:hover,
   &:focus {
     color: var(--#{$prefix}dropdown-link-hover-color);