docs(ui): dark mode fixes (#5204)

* docs(ui): dark mode fixes

* apply color on the body

* remove z-index

www/apps/ui/src/examples/drawer-demo.tsx

@@ -1,4 +1,4 @@
-import { Button, Drawer } from "@medusajs/ui"
+import { Button, Drawer, Text } from "@medusajs/ui"
 
 export default function DrawerDemo() {
   return (
@@ -10,7 +10,9 @@ export default function DrawerDemo() {
         <Drawer.Header>
           <Drawer.Title>Edit Variant</Drawer.Title>
         </Drawer.Header>
-        <Drawer.Body></Drawer.Body>
+        <Drawer.Body className="p-4">
+          <Text>This is where you edit the variant&apos;s details</Text>
+        </Drawer.Body>
         <Drawer.Footer>
           <Drawer.Close asChild>
             <Button variant="secondary">Cancel</Button>