Daisy UI

export default {
  theme: {
    backgroundImage: {
      pattern: "var(--image)"
    }
  },
  daisyui: {
    themes: [
      {
        light: {
          "--image": "url('example.com')"
        },
        dark: {
          "--image": "url('dark.example.com')"
        }
      }
    ]
  }
}