> For the complete documentation index, see [llms.txt](https://argos-ci.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://argos-ci.com/docs/learn/how-to-guides/visual-coverage/injecting-css.md).

# Injecting CSS

Argos can apply custom CSS while a screenshot is taken — useful to hide or restyle elements that the [built-in helpers](/docs/learn/reliability-and-flakiness/flaky-tests/argos-helpers.md#helpers) don't cover, such as third-party iframes or complex dynamic regions.

### Add CSS while taking the screenshot

All our SDKs support an `argosCSS` option that allows you to specify custom CSS evaluated during the screenshot process. The style will be removed from the page after the screenshot is taken.

```ts
// Usage in Playwright or Puppeteer
await argosScreenshot(page, "my-screenshot", {
  argosCSS: `iframe { display: none; }`,
});

// Usage in Cypress
cy.argosScreenshot("my-screenshot", {
  argosCSS: `iframe { display: none; }`,
});
```

### Add CSS in your code

Argos adds a `__argos__` class to the HTML element during screenshots. You can target this class in your CSS for Argos-specific styling.

```css
.__argos__ iframe {
  display: none;
}
```

Both approaches only affect screenshots — your app's rendering outside Argos is untouched.


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