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How can I use the "clamp" function with Webflow? I have already placed an HTML Embed code in the body to apply custom styling, and I have set the root with my variables. However, the "clamp" function is not working. Can someone help me with this issue in Webflow?

TL;DR
  • Define CSS variables using :root inside a <style> tag placed in the page <head> or visible body area.
  • Apply variables correctly without nesting clamp() inside var(), and validate all CSS for correct syntax and units.
  • Ensure custom styles aren't overridden by Webflow Designer by increasing specificity or using !important if necessary.
  • Use browser DevTools to verify variable application, computed styles, and detect any syntax errors.

You're attempting to use the CSS clamp() function via an HTML Embed in Webflow, but it’s not rendering as expected. This usually points to an issue with syntax, variable setup, or selector specificity.

1. Verify CSS Variable Definition at the :root

  • Define your custom properties (variables) inside a :root selector in the <style> tag within an HTML Embed component.
  • Example:
    ```css
    :root {
    --fs-base: clamp(1rem, 2.5vw, 2rem);
    }
    ```
  • Make sure this embed is placed in the page <head> or the body, not inside a component that's conditionally rendered or hidden.

2. Check Where and How Variables Are Used

  • Apply the variable like this in your CSS:
    ```css
    .my-class {
    font-size: var(--fs-base);
    }
    ```
  • Ensure you're not mixing clamp() and var() incorrectly, like clamp(var(--fs-base)) (invalid if --fs-base already contains a clamp()).

3. Ensure Your CSS Syntax is Valid

  • Any CSS parsing error in your <style> tag can cause the entire block to be ignored.
  • Validate your clamp() statement. Correct syntax is:
  • clamp(MIN, PREFERRED, MAX) — all values must be in compatible units (e.g., all using rem or px/vw).

4. Avoid Webflow Conflicts

  • If you're also trying to apply font-size or other styles via the Webflow Designer AND custom CSS, the Webflow styles may override your custom styles.
  • To increase specificity, use more targeted selectors or !important as a last resort. Example:
    ```css
    .my-class {
    font-size: var(--fs-base) !important;
    }
    ```

5. Use Dev Tools to Debug

  • Open Chrome DevTools, inspect the element, and check:
  • Whether your variable is applied correctly.
  • If the clamp() value is computed or overridden.
  • If there are any syntax errors preventing your CSS block from loading.

6. Placement of Your Embed Code

  • Ensure your <style> embed is placed in a visible and loaded part of the page:
  • Preferably inside an HTML Embed block at the top of the Body.
  • Alternatively, use Page Settings → Before for global styles.

Summary

Ensure your clamp() function is defined correctly within a :root selector, you're using valid CSS syntax, and you're not getting overridden by Webflow’s Designer styles. Use browser DevTools to confirm variable application and debug rendering issues.

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