message: Update customize-theme.mdx
  mode from the core is not working properly
diff: @@ -142,7 +142,8 @@ styles can be a style object or a function that returns a style object.
  ```jsx live=false
  // theme.js
  -import { extendTheme, mode } from "@chakra-ui/theme"
  +import { extendTheme } from "@chakra-ui/theme"
  +import { mode } from "@chakra-ui/theme-tools"
  // Version 1: Using objects
  const theme = extendTheme({
  