How can I troubleshoot a custom code solution for a max-font-size property in Webflow that is not working properly on different screen sizes?

Your custom code for a max-font-size in Webflow isn’t working properly across different screen sizes, likely due to how CSS handles responsive units or conflicts with Webflow's native styles. Here’s how to troubleshoot and fix the issue.

1. Check Your CSS Syntax and Placement

• Go to your Webflow Project, then Page Settings or Site Settings → Custom Code.
• Ensure your CSS is wrapped in <style> tags and placed within the before or before section.
• Example of incorrect use: max-font-size is not a valid CSS property unless used inside a clamp() or scoped custom property calculation.

2. Use clamp() Correctly

• max-font-size by itself is not a valid CSS property. Instead, use clamp(min, preferred, max) to define responsive font sizes.
• Example:
  font-size: clamp(16px, 2vw, 24px);
• This ensures the font size responds to the viewport but stays between 16px and 24px.

3. Check for Conflicting Webflow Styles

• Webflow might override your styles with its Designer-based settings.
• Use Webflow’s Style Panel to check if the element already has a font size, which can override custom code unless you add !important.
• Try targeting the desired class with more specific CSS selectors or using !important (e.g., .my-heading { font-size: clamp(...) !important; }).

4. Ensure Proper Class Targeting

• Verify that the CSS class in your custom code matches exactly what’s applied in Webflow.
• Use Webflow’s Navigator or Style panel to confirm the class name and structure.
• Avoid targeting tags (like h1) without a class, especially if Webflow generates additional styling.

5. Inspect with DevTools Across Breakpoints

• Use Chrome DevTools (Right-click → Inspect) and adjust viewport sizes under Responsive Design Mode.
• Confirm the effective computed font size using the Styles tab, and see if your clamp() rule is applied or being overridden.

6. Check Code Load Timing

• Custom code in Webflow loads after Designer styles, so placing it in the before section might be necessary to override Webflow's styling.
• However, certain layout-affecting CSS should still go in before , especially for font styles.

7. Preview and Publish Consistency

• Custom code may not render in Webflow’s Designer Preview. Always use Publish to test live behavior.
• Be sure to clear your cache or use incognito while testing published pages.

Summary

Your max-font-size issue is likely due to incorrect property usage—max-font-size isn’t valid CSS. Use clamp() for responsive font sizing, ensure your selectors are specific, avoid Webflow overrides, and test across screen sizes using DevTools. Always publish to test custom code changes properly.