CSS Flexbox Generator & Playground
Interactively customize Flexbox alignment, direction, wrapping, and spacing with live visual feedback.
Flex Container Properties
Live Interactive Flex Canvas
What is the CSS Flexbox Generator?
The NexTools CSS Flexbox Generator & Visual Playground is an interactive developer tool that simplifies learning, prototyping, and generating Flexible Box Layout module code. Flexbox is the cornerstone of responsive web design, providing seamless alignment, centering, and distribution of space among items within a container, even when their sizes are unknown or dynamic.
Remembering how cross-axis alignment (`align-items`) interacts with main-axis alignment (`justify-content`) and how direction flips axes can be frustrating. Our visual playground provides real-time visual demonstration of every property change and outputs clean CSS rules ready to paste directly into stylesheets or Tailwind configs.
Key Capabilities & Features
Live Visual Property Playground
Experiment with flex-direction, justify-content, align-items, flex-wrap, and gap with instant visual animation.
Interactive Item Spacing & Gaps
Fine-tune pixel-perfect negative space using modern CSS `gap` properties without requiring hacky margins.
Dynamic Element Addition
Add or remove flex boxes dynamically to test responsiveness and multi-line wrapping behavior.
One-Click CSS Copy
Copy verified, production-ready CSS container declarations immediately into your project stylesheet.
How to Build Flexbox Layouts
Select Direction & Wrap
Choose horizontal (row) or vertical (column) flow and specify if items should wrap onto new lines.
Configure Alignments & Gap
Adjust main-axis (`justify-content`) and cross-axis (`align-items`) alignment dropdowns and set gutter gap.
Copy CSS Declaration
Click "Copy CSS" and paste directly into your CSS classes or Tailwind utility rules.
Frequently Asked Questions (FAQ)
How do I center a div both horizontally and vertically with Flexbox?
To achieve perfect centering, set `display: flex; justify-content: center; align-items: center;` on the parent container.
What is the difference between space-between and space-evenly?
`space-between` pushes the first item to the very start edge and the last item to the very end edge with equal spacing between them. `space-evenly` distributes identical spacing between all items AND the container edges.
Is the CSS 'gap' property widely supported for Flexbox?
Yes. The modern CSS `gap` property for flexbox is supported by 97%+ of web browsers worldwide including Chrome, Edge, Safari 14.1+, and Firefox.