How css flexbox generator works
Flexbox has two roles and this tool generates the first one: the container. Choosing flex-direction, justify-content, align-items, flex-wrap, and gap produces the declaration block that turns any element into a flex container. Every value maps one-to-one to a CSS property, and the preview applies the identical declarations to a row of sample boxes so what you see is what the browser will render.
The generator writes minimal CSS by default: display: flex plus only the properties that differ from the CSS initial values — flex-direction: row, justify-content: flex-start, align-items: stretch, and flex-wrap: nowrap are the spec defaults and are omitted unless you ask for them with the include-defaults switch. gap is emitted only when greater than zero. Fewer declarations mean less to review, and nothing you did not choose shows up in the output.
Copy the block into your stylesheet, or read it as a cheat sheet: justify-content positions items along the main axis (the direction row or column travels), align-items positions them on the cross axis, and wrap controls whether items stay on one line. Pair it with the grid generator when you need two-dimensional placement — flexbox handles one direction at a time.