message: Add `padding` to main `column` in `cached` example
diff: @@ -115,7 +115,8 @@ impl Sandbox for App {
  )
  .on_submit(Message::AddOption(self.input.clone())),
  ]
  - .spacing(20),
  + .spacing(20)
  + .padding(20),
  )
  .into()
  }
  