CSS Visual Generator
Generate modern CSS code visually. All new CSS features in one powerful tool!
CSS changed more between 2024 and 2026 than in the previous decade, and most front-end developers have not caught up. Things that used to need an SVG mask, a JavaScript loop or a design-system workaround now fit in one declaration: Apple-style squircle corners, stars and arrows clipped with a readable shape function, carousel dots the browser draws for you, headings that sit exactly on a grid line, staggered animations without a single nth-child rule, and theme logic written as an inline if. The problem is not capability. It is that the syntax is new, the specifications moved quickly, browser support is uneven, and the official examples assume you already know the spec. This CSS generator lets you set each feature with sliders and buttons, watch the preview update, and copy code you can paste straight into a stylesheet. Below the tool we explain what each feature replaces, where it is safe to ship today, and how to wrap it so that older browsers still get a page that looks deliberate rather than broken.
What this tool does
A visual CSS generator for features most generators ignore
Classic CSS generators cover gradients, box shadows and border radius. Those are solved problems, and your editor's autocomplete handles them well. This tool focuses on the recent additions that are genuinely hard to write from memory, grouped into seven panels:
- Corner shape: round, squircle, bevel, notch and scoop corners through the
corner-shapeproperty, paired withborder-radius. - Shape function: stars, hexagons, arrows, crosses and hearts using the CSS
shape()function insideclip-path, which reads like drawing commands rather than a wall of polygon percentages. - Scroll markers: carousel navigation dots, lines or numbers generated by the browser with
::scroll-marker, no script required. - Text box trim:
text-boxtrimming of the invisible space above capitals and below the baseline, so text aligns optically with icons and boxes. - Sibling index:
sibling-index()andsibling-count()for staggered heights, delays and colours computed from an element's position. - If function: inline conditional values with
if(), for light and dark themes or state switches in one declaration. - Custom functions: reusable
@functiondefinitions such as a transparency helper or a fluid size calculator.
Everything runs in your browser. The preview uses your own browser's CSS engine, which is useful in itself: if a preview looks plain, your browser does not support that feature yet, and neither will a share of your visitors.
Use cases
What each feature actually replaces
Squircle buttons and app icons
Designers have asked for iOS-style continuous corners for years, and the usual fix was an SVG mask or a clip-path that broke borders and shadows. With corner-shape: squircle the browser draws the smooth curve and keeps borders, outlines and shadows following the shape.
Badges, ribbons and decorative cut-outs
Sale badges, notched cards and arrow-shaped tabs used to be background images. The shape() function draws them in CSS with relative units, so they scale with text and respond to container size, which polygon() with fixed percentages handles badly.
Carousels without a JavaScript library
Scroll snapping already made CSS-only carousels possible, but the dots still needed script. Scroll markers let the browser generate one dot per item, highlight the active one and make each clickable, which removes a dependency and an accessibility audit headache.
Pixel-tight typography
Every font carries extra space above capitals and below the baseline, so a heading never quite lines up with the icon beside it. Text-box trim removes that space using the font's real metrics, ending years of negative-margin guesswork.
Staggered list animations
Fading list items in one after another usually means a style attribute per item or ten nth-child rules. sibling-index() lets a single rule compute each item's delay or height from its position, and it keeps working when the list length changes.
Design tokens with logic
if() and @function bring small amounts of logic into stylesheets: pick a colour based on a custom property, or define a fluid-size helper once and call it everywhere. Design systems get shorter and far easier to audit.
Ship it safely
Browser support, honestly
These features first landed in Chromium, which means Chrome, Edge, Opera, Brave and Samsung Internet. Safari has shipped some of them and Firefox fewer. As of mid-2026, corner-shape works in Chrome and Edge from version 139 but not in Safari or Firefox. Treat everything in this tool as progressive enhancement: the page must look acceptable without it, and better with it.
The pattern is always the same. Write a solid baseline first, then layer the new feature inside @supports. For example, give a card border-radius: 24px, then add @supports (corner-shape: squircle) { .card { corner-shape: squircle; } }. Unsupported browsers get rounded corners; supported browsers get the squircle. Nobody gets a broken layout. Check current support on MDN's CSS reference or caniuse before you rely on any of them for something functional rather than decorative.
A strong opinion, held loosely: decoration is the right place to adopt new CSS early, and layout is the wrong one. A missing squircle costs nothing. A missing carousel dot can cost a sale. If you also care about how fast these pages render, our WebP converter will usually save more load time than any CSS refactor, and the schema markup generator handles the structured data side of the same pages.
Step by step
How to use the CSS generator without breaking older browsers
Generating the code is the easy part. Steps four and five are what keep a shiny new property from turning into a layout bug report.
Choose the feature panel you need
Use the tabs across the top of the generator to switch between Corner Shape, Shape Function, Scroll Markers, Text Box, Sibling Index, If Function and Custom Functions. Each panel is independent, so settings in one never affect another. Start with the visual result you want, such as a squircle button or a staggered list, and pick the panel that produces it rather than browsing every feature.
Adjust the controls and watch the live preview
Move the sliders, pick presets and choose colours. The preview redraws immediately using your own browser's rendering engine. That doubles as a support check: if the preview stays plain or square while the controls change, your browser does not support that feature yet. Try the same panel in a current version of Chrome or Edge to see the intended effect before deciding whether to use it.
Copy the generated CSS into your stylesheet
Press Copy on the code panel under the preview and paste the rules into your stylesheet or component. Rename the example class to match your own naming convention, and replace hard-coded colours with your design tokens or custom properties where you have them. The output is plain CSS with no preprocessor syntax, so it works in Sass, PostCSS, Tailwind layers or a WordPress Additional CSS box.
Wrap the new property in a fallback
Before shipping, write the safe version first, such as an ordinary border-radius, a fixed animation delay or a simple polygon. Then put the generated code inside an @supports block that tests the specific property or function. Browsers that understand it apply the upgrade, and everything else keeps the baseline. This one habit is the difference between progressive enhancement and a bug report from a Firefox or Safari user.
Test in at least three browser engines
Open the page in a Chromium browser, Safari and Firefox, on desktop and on a phone. Check that text stays readable, nothing overlaps, and clickable areas are still clickable when the feature is missing. For scroll markers, also test keyboard navigation with Tab and the arrow keys. Only call the job finished when the unsupported experience looks intentional rather than unfinished.
When these features arrived
Sources: caniuse, corner-shape: squircle; Web Platform features explorer, June 2025; Chrome for Developers on CSS if(). Support changes quickly, so check before you ship.
⚙️ Corner Shape Controls
👁️ Preview
📋 Generated CSS
⚙️ Shape Function Controls
👁️ Preview
📋 Generated CSS
⚙️ Scroll Marker Controls
👁️ Preview (Carousel)
📋 Generated CSS
⚙️ Text Box Controls
👁️ Preview
Text aligns with box when trimmed
📋 Generated CSS
⚙️ Sibling Index Controls
👁️ Preview
📋 Generated CSS
⚙️ If Function Controls
👁️ Preview
Theme Demo
Click to switch theme
📋 Generated CSS
⚙️ Custom Function Builder
👁️ Preview
📋 Generated CSS
FAQ
Frequently asked questions
Is this CSS generator free and does it upload my code?
It is completely free with no account, and nothing is uploaded. Every panel runs in your browser with plain JavaScript, and the generated CSS is built on your device. You can use the output in personal, client and commercial projects without attribution. The only thing that leaves your computer is the page request itself, the same as visiting any other website, so it is safe to use behind a company network.
Why does the preview look plain or unchanged in my browser?
The preview uses your browser's own CSS engine, so if a feature is not supported there, nothing visible happens. That is accurate rather than a bug: it shows you exactly what your visitors on the same browser will see. Most of these features shipped first in Chromium-based browsers such as Chrome and Edge. Open the tool in a recent version of one of those to see the full effect.
What is a squircle in CSS?
A squircle is a shape between a square and a circle with a continuous curve, rather than a quarter-circle joined to a straight edge. Apple uses it for app icons, and it looks softer than ordinary rounded corners. In CSS you create it by combining border-radius with corner-shape: squircle. Browsers without support fall back to normal rounded corners automatically, which makes it a very safe progressive enhancement.
How is shape() different from polygon() in clip-path?
polygon() only draws straight lines between percentage points, so curves need dozens of points and the shape cannot easily mix units. The newer shape() function uses drawing commands similar to SVG paths, including lines, curves and arcs, and accepts any CSS unit or calc() expression. That makes responsive, readable shapes far easier. Keep a polygon() version as the fallback for browsers that do not support shape() yet.
Can I build a carousel with only CSS now?
Mostly, yes. Scroll snapping handles the sliding, and the ::scroll-marker pseudo-element lets the browser generate navigation dots that track the active slide and respond to clicks. Support is currently strongest in Chromium browsers. Build the carousel so it still works as a horizontally scrollable row without the markers, and test keyboard and screen reader behaviour, which matters more than the visual polish of the dots.
What does text-box trim actually fix?
Fonts reserve space above capital letters and below the baseline for accents and descenders. That space makes text look offset inside buttons, badges and next to icons, even when the padding is mathematically equal. text-box trims that space using the font's own metrics, so a button labelled in capitals looks truly centred. Without support, text simply keeps its normal spacing, so it degrades gracefully.
Is it safe to use CSS if() and @function in production?
For now, only behind a fallback. Both are very new and are not supported in every engine, and a browser that does not understand a value containing if() treats the whole declaration as invalid. Declare a plain value first, then the if() version on the next line, so older browsers keep the first one. Use @function for convenience in projects that can tolerate a Chromium-first experience.
Does the generated CSS work with Tailwind or WordPress?
Yes. The output is standard CSS, so you can paste it into a Tailwind @layer block, a CSS module, a Sass file or the Additional CSS panel in WordPress. In Tailwind, an arbitrary property utility such as [corner-shape:squircle] also works for single declarations. In WordPress with GeneratePress or a block theme, add the class to the block in its Advanced settings and keep the CSS in your child theme or customiser.
Will these features slow my site down?
No, they usually speed it up. Each one replaces something heavier: an SVG mask, a JavaScript carousel library, or a script that sets animation delays. Native CSS is parsed once and rendered by the browser's optimised engine, without extra network requests or main-thread work. The only cost is a few bytes of extra CSS for fallbacks, which is negligible compared with the JavaScript you get to delete.
Half the JavaScript in a typical marketing site now has a one-line CSS replacement.
Squircles, staggered animations, theme switches and carousel dots all moved into CSS between Chrome 133 and 139. The catch is shipping them with a fallback.
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