diff --git a/.changeset/slimy-queens-pull.md b/.changeset/slimy-queens-pull.md
new file mode 100644
index 000000000..c4295e2ea
--- /dev/null
+++ b/.changeset/slimy-queens-pull.md
@@ -0,0 +1,5 @@
+---
+"@tabler/core": patch
+---
+
+Fix the `z-index` value of the `nav-tab` inside `card-tab` #1933
diff --git a/src/scss/_variables.scss b/src/scss/_variables.scss
index 4af88b77d..d79cad370 100644
--- a/src/scss/_variables.scss
+++ b/src/scss/_variables.scss
@@ -605,6 +605,8 @@ $card-header-tabs-bg: var(--#{$prefix}bg-surface-tertiary) !default;
 $cards-grid-gap: var(--#{$prefix}page-padding) !default;
 $cards-grid-breakpoint: lg !default;
 
+$zindex-dropdown: 1;
+
 // Carousel
 $carousel-control-color: $white !default;
 $carousel-control-icon-width: 1.5rem !default;