fix: kbd border width

Author: saadeghi

packages/daisyui/src/components/kbd.css

@@ -3,7 +3,8 @@
   padding-left: 0.5em;
   padding-right: 0.5em;
   border: var(--border) solid color-mix(in srgb, var(--color-base-content) 20%, #0000);
-  border-bottom-width: calc(var(--border) + 1px);
+  border-bottom: calc(var(--border) + 1px) solid
+    color-mix(in srgb, var(--color-base-content) 20%, #0000);
   --size: calc(var(--size-selector, 0.25rem) * 6);
   font-size: 0.875rem;
   height: var(--size);