Border separator added

Author: RomanPogorov

packages/react-components/src/index.css

@@ -34,6 +34,7 @@
   --color-border-primary: var(--color-neutral-300);
   --color-border-primary_hover: var(--color-neutral-400);
   --color-border-secondary: var(--color-neutral-200);
+  --color-border-separator: var(--color-neutral-200);
   --color-border-disabled: var(--color-neutral-100);
   --color-border-brand: var(--color-brand-500);
   --color-border-error: var(--color-red-500);