UD5 Toolkit
Flexbox Alignment Playground - Online Visual Align & Justify
Change all alignment and justification values and see the flex items move. Indispensable for learning Flexbox.
Flexbox Playground - Online CSS Flex Layout Generator
Flexbox Playground
Interactive CSS Flexbox layout generator. Adjust container and item properties below – changes are reflected in real time.
Container Properties
Only effective when flex-wrap is
wrap or wrap-reverse.Item Properties None
Click an item in the preview to edit its properties.
px
Live Preview
Click any colored box to select and modify its individual flex properties.
Generated CSS
Frequently Asked Questions
Flexbox (Flexible Box Layout) is a one‑dimensional layout model in CSS that allows you to distribute space along a single axis – either horizontally or vertically. It gives you powerful alignment and spacing capabilities, making it much easier to create responsive, modern web layouts without using floats or complex positioning.
The most important container properties are:
display: flex (or inline-flex), flex-direction (row / column), flex-wrap (nowrap / wrap), justify-content (main‑axis alignment), align-items (cross‑axis alignment for all items), align-content (spacing between wrapped lines), and gap (spacing between items). This playground lets you adjust all of them in real time.
Set the parent container to
display: flex; justify-content: center; align-items: center;. justify-content centers along the main axis, and align-items centers along the cross axis. Try it in the playground above!
align-items aligns individual flex items along the cross axis inside their line, while align-content controls the spacing between multiple lines when
flex-wrap: wrap is active. If there is only one line, align-content has no visible effect.
flex-basis defines the initial main size of a flex item before free space is distributed. It can be auto (use the item's content size) or a specific length (like 200px). Combined with flex-grow and flex-shrink, it determines how the item behaves when the container resizes.
Use
flex-wrap: wrap to let items flow into multiple rows/columns. You can then use percentages or flex-basis alongside flex-grow to create fluid grids. Media queries can also change flex-direction to stack items on small screens.
Flex‑Basis Calculator & Visualizer - Online CSS Flex
Enter container width, number of items, gap, and flex‑basis. See the resulting sizes instantly. Plan your flex layout.
Box Shadow Playground - Online Visual CSS Shadow Editor
Interactively add and adjust multiple box shadows on a sample element. Drag sliders for offset, blur, spread, and color. Copy the clean CSS code instantly.
Random Box Model Snippet - Online CSS Layout Practice
Generate a random HTML/CSS card with different box model properties. Inspect and guess the size. For learners.
Isometric Box CSS Generator – Online 3D Cube Builder
Set width, height, depth, and colors to generate an isometric box using CSS transforms. Copy to your project.
Box Shadow CSS Generator - Online Shadow Effect Designer
Design layered box shadows interactively and get the CSS code in real time. Adjust offset, blur, spread, and color. Essential tool for UI designers.
CSS Ribbon Generator - Online Corner Banner Design
Create a 'SALE' or 'NEW' corner ribbon in pure CSS. Adjust colors, position, and text. Great for e‑commerce.
CSS Scroll Snap Generator - Online Visual Builder
Visually configure scroll‑snap containers and items. Adjust alignment, stop behavior, and padding. Copy the clean CSS instantly.
box‑decoration‑break Demo - Online Inline Box Fragmentation
See the difference between clone and slice on inline boxes that break across lines. Useful for multi‑line headings.
CSS Blend Mode Playground – Online background-blend-mode & mix-blend-mode
Load images or use colors and apply all 15 CSS blend modes. Visual tester for creative effects.
Neumorphism CSS Generator - Online Soft UI Design Tool
Design neumorphic elements by adjusting box‑shadow parameters. Real‑time preview and CSS output. For modern soft UI interfaces.
Typing Layout Visualizer – QWERTY, Dvorak, Colemak
Compare standard keyboard layouts side-by-side. Click keys to see characters. Useful for learning alternative layouts.
CSS Subgrid Layout Builder - Online Align Nested Grids
Design a layout where nested grids share track sizes with their parent via subgrid. Copy the complete CSS.
Scroll Progress Bar Generator - Online CSS‑Only
Create a pure CSS scroll progress indicator using animation‑timeline: scroll(). No JavaScript. Copy the complete code.
CSS Compatibility Linter - Online Check Browser Support
Paste your CSS and see warnings for properties that have limited browser support. Links to CanIUse. Modernize safely.
WebGPU Shader Playground - Online WGSL Editor
Write a compute shader in WGSL and run it in the browser. See the output on a canvas. Learn WebGPU. Real‑time compilation.
touch‑action CSS Playground - Online Gesture Control
Limit browser gestures on an element: pan‑x, pinch‑zoom, manipulation. Draw on a canvas to test. Mobile dev helper.
Advanced CSS Gradient Builder - Online Multi‑Stop & Angle
Create complex linear gradients with any number of color stops, exact angles, and length units. Live preview and CSS code.
Text Decoration CSS Generator - Online Underline & Strike
Style underlines, overlines, and strike-throughs with colors, wavy styles, and thickness. Modern CSS text‑decoration.
CSS Glow Hover Effect - Online Animated Box Shadow
Design a button or card that glows on hover. Adjust shadow color, spread, and transition. Copy the CSS. Rich UI.
CSS Letterpress Text Effect - Online Inset Typography
Create a realistic letterpress (debossed) text effect using CSS text‑shadow and background. Adjust depth and light direction. Copy code.
Noise Texture & Grain Generator - Online CSS Background
Generate a subtle noise/grain texture as a CSS background pattern. Adjust opacity and size. For that film look.
CSS Checkerboard Pattern - Online Background Generator
Create a customizable checkerboard or grid background using pure CSS gradients. Adjust cell size and colors. Copy the code.
Image Blend Mode Tester - Online Overlay Two Photos
Upload two images and apply CSS blend modes (multiply, screen, overlay, etc.). See the result and copy the filter CSS. Pure frontend.
Print CSS Generator - Online Optimize Page for Paper
Add print styles like removing backgrounds, adding page breaks, setting margins. See print preview instantly.
CSS Countdown Number Animation - Online Flip Clock Effect
Create a pure CSS countdown timer with a flipping number effect. Adjust duration and style. No JavaScript needed for display.
Animated Border CSS Generator - Online Glow & Rotate
Create a glowing or rotating border animation around an element. Copy the CSS keyframes. Pure CSS magic.
CSS Progress Bar Generator - Online Animated & Styled
Create a custom HTML/CSS progress bar with percentage, colors, and animation. Copy the code. Modern UI element.
Keyboard Layout Tester - Online Visual Key Press Viewer
Press any key and see it light up on a standard QWERTY layout. Check functionality or demonstrate shortcuts.
Neon Sign Text Effect - Online Glowing CSS Generator
Design a realistic neon sign text with multiple layers of glow. Copy the CSS and HTML. Perfect for headers.