Flexbox Generator

Finally, a way to center a <div> without losing your mind. Visually align items, manage gaps, and copy the exact CSS syntax you need.

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Mastering the Flexible Box Module

We have all been there: staring at a screen, randomly changing margin and padding values, praying that an icon will finally align with its text. The CSS Flexible Box Layout Module (Flexbox) was engineered specifically to solve this exact frustration.

Flexbox provides a highly efficient way to lay out, align, and distribute space among items in a container, even when their size is unknown or dynamic. If you want a deep dive into the underlying mechanics, the definitive guide is available on the MDN Web Docs, or you can check the excellent visual breakdown on CSS-Tricks.

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Pro Tips for Modern Alignments

  • The Holy Grail of Centering: To perfectly center anything on a screen, make the parent container display: flex; and set both justify-content and align-items to center. It works every single time.
  • Ditch the Margins: Stop using margin-right on list items to space them out. Use the gap property on the Flexbox container instead. It creates perfect, even spacing without adding unwanted extra space to the last item.
  • Grid vs. Flexbox: Flexbox is meant for one-dimensional layouts (a single row or a single column, like a navigation bar). If you are building a full page layout with both rows and columns simultaneously, you should switch over to our CSS Grid Builder.

Frequently Asked Questions

What is the difference between justify-content and align-items?

justify-content aligns your items along the main axis. If your flex-direction is row, this means horizontal alignment. align-items aligns your items along the cross axis (vertically, if the direction is a row).

Why is my gap property not working?

The gap property is relatively modern. Make sure you are applying it to the parent container (the one with display: flex;), not the individual child items. It is fully supported in all modern browsers.

How can I make flex items wrap to the next line?

By default, flex items will try to shrink to fit onto a single line. To allow them to stack on smaller screens, you must add flex-wrap: wrap; to the parent container.