This example demonstrates how flex items behave by default and how to make them grow using `flex-grow`.
Without explicit width or grow utilities, flex items only take up the space their content needs.
The `flex-grow` utility allows flex items to expand and fill available space in the flex container.
Flex items won't automatically take up the full width or distribute space unless you instruct them to. Use `flex-grow` on child items if you want them to expand and fill available horizontal space in the flex container. Alternatively, explicit width utilities like `w-1/2`, `w-1/3` etc., can be used on children, but `flex-grow` is key for responsive distribution of *remaining* space.