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CSS & Design Generators

CSS Accordion Generator

Create a pure-CSS accordion (no JavaScript) with the native details element — style the header, icon, border, and radius, then copy accessible HTML + CSS. Free.

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What is an accordion?
A collapsible panel that shows and hides content when clicked.
Does it need JavaScript?
No — this uses the native <details> element, so it works with pure HTML and CSS.
Is it accessible?
Yes, <details> is keyboard-friendly and announced by screen readers.

💡 How to use

  • Built on the native <details>/<summary> elements — no JavaScript, fully accessible.
  • Add open to a <details> to have it expanded by default.
  • Copy the HTML and CSS, then add your own questions and answers.

Free CSS Accordion Generator

Create a pure-CSS accordion with no JavaScript and copy the code in one click. Style the header, border, icon, radius, and padding with a live preview — built on the native details and summary elements, so it is accessible by default. Free, no sign-up, runs in your browser.

What is an accordion?

An accordion is a set of collapsible panels, each with a clickable header that expands to reveal its content. It is a space-saving pattern used for FAQs, product details, settings, and long-form content, letting users open only the sections they care about. This generator builds one from the native details and summary elements, so it works with pure HTML and CSS — no JavaScript required.

How to use the accordion generator

It is instant:

  • Style the header background and text, border, and expand/collapse icon.
  • Set the corner radius and padding.
  • Click the preview panels to test the open and closed states.
  • Copy the HTML and CSS, then add your own headings and content.

Why use the native details element

The details and summary elements give you accordion behaviour for free. The browser handles opening and closing when the summary is clicked, and it does so accessibly — the control is keyboard-focusable, toggles with Enter or Space, and is announced correctly by screen readers. Because there is no JavaScript, the accordion works even before scripts load and cannot break due to a script error, which makes it robust and fast.

Styling the expand and collapse icon

By default browsers show a small triangle marker on the summary. This generator hides that default marker and adds its own icon with a pseudo-element — a plus sign that rotates into a cross when the panel opens, using the details[open] selector. You can restyle this to a chevron or arrow. Hiding the default marker requires both list-style: none and the -webkit-details-marker rule, both of which the generated CSS includes.

Accordions, FAQs, and SEO

Accordions are especially popular for FAQ sections, and they play nicely with SEO because the content is real, crawlable HTML — it is present in the page even when collapsed, unlike content injected by script on demand. If you mark up your questions and answers with FAQ structured data, you can also become eligible for FAQ rich results in search. Keep each answer concise and genuinely helpful for the best effect.

Pro tip

Add the open attribute to the first details so the accordion starts with one panel expanded, giving users a hint of the content. For an FAQ, pair this with our FAQ Schema Builder to generate the structured data, and keep your headings phrased as the questions people actually search for.

FAQ

Is this CSS Accordion Generator free?
Yes. It is completely free, runs in your browser, and requires no account or sign-up.
Does the accordion need JavaScript?
No. It is built on the native details and summary elements, so opening and closing works with pure HTML and CSS.
Is a details-based accordion accessible?
Yes. The details element is keyboard-focusable, toggles with Enter or Space, and is announced by screen readers, so it is accessible by default.
How do I make a panel open by default?
Add the open attribute to that details element, for example <details open>. It will render expanded when the page loads.
How do I hide the default triangle marker?
Set list-style: none on the summary and add the ::-webkit-details-marker { display: none } rule, both of which the generated CSS includes, then add your own icon.
Are accordions good for SEO?
Yes. The content is real HTML present in the page even when collapsed, so it is crawlable. Adding FAQ structured data can also make an FAQ accordion eligible for rich results.
Does it work in all browsers?
Yes. The details and summary elements are supported in all modern browsers, including current Chrome, Edge, Firefox, and Safari.

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