Update theme.css

Author: iamdavidhill

packages/ui/src/styles/theme.css

@@ -56,7 +56,7 @@
     0 6px 8px -4px rgba(19, 16, 16, 0.12), 0 4px 3px -2px rgba(19, 16, 16, 0.12),
     0 1px 2px -1px rgba(19, 16, 16, 0.12);
   --shadow-xs-border:
-    0 0 0 1px var(--border-base, rgba(11, 6, 0, 0.20)),
+    0 0 0 1px var(--border-weak-base, rgba(11, 6, 0, 0.20)),
     0 1px 2px -1px rgba(19, 16, 16, 0.04),
     0 1px 2px 0 rgba(19, 16, 16, 0.06),
     0 1px 3px 0 rgba(19, 16, 16, 0.08);