Index: lams_central/web/css/bootstrap/_toasts.scss
===================================================================
diff -u -rb7c92dbcfdb0469dbc0144190a201757f398e529 -ra90d0744dd0d09d1b04869e61ce1b66bf1ee3242
--- lams_central/web/css/bootstrap/_toasts.scss	(.../_toasts.scss)	(revision b7c92dbcfdb0469dbc0144190a201757f398e529)
+++ lams_central/web/css/bootstrap/_toasts.scss	(.../_toasts.scss)	(revision a90d0744dd0d09d1b04869e61ce1b66bf1ee3242)
@@ -1,11 +1,12 @@
 .toast {
   // scss-docs-start toast-css-vars
+  --#{$prefix}toast-zindex: #{$zindex-toast};
   --#{$prefix}toast-padding-x: #{$toast-padding-x};
   --#{$prefix}toast-padding-y: #{$toast-padding-y};
   --#{$prefix}toast-spacing: #{$toast-spacing};
   --#{$prefix}toast-max-width: #{$toast-max-width};
   @include rfs($toast-font-size, --#{$prefix}toast-font-size);
-  --#{$prefix}toast-color: #{$toast-color}; // stylelint-disable-line custom-property-empty-line-before
+  --#{$prefix}toast-color: #{$toast-color};
   --#{$prefix}toast-bg: #{$toast-background-color};
   --#{$prefix}toast-border-width: #{$toast-border-width};
   --#{$prefix}toast-border-color: #{$toast-border-color};
@@ -37,8 +38,10 @@
 }
 
 .toast-container {
+  --#{$prefix}toast-zindex: #{$zindex-toast};
+
   position: absolute;
-  z-index: $zindex-toast;
+  z-index: var(--#{$prefix}toast-zindex);
   width: max-content;
   max-width: 100%;
   pointer-events: none;
@@ -59,7 +62,7 @@
   @include border-top-radius(calc(var(--#{$prefix}toast-border-radius) - var(--#{$prefix}toast-border-width)));
 
   .btn-close {
-    margin-right: calc(var(--#{$prefix}toast-padding-x) * -.5); // stylelint-disable-line function-disallowed-list
+    margin-right: calc(-.5 * var(--#{$prefix}toast-padding-x)); // stylelint-disable-line function-disallowed-list
     margin-left: var(--#{$prefix}toast-padding-x);
   }
 }