How can I implement a plugin to invert the colors of my logo and menu button in Webflow based on the background color of my slider, in real time and without manual intervention?

TL;DR

Assign unique IDs/classes to the logo and menu button, and ensure the slides have identifiable background classes (e.g., .dark-bg, .light-bg).
Create an .invert CSS class using filter: invert(1) and use JavaScript to detect the active slide and toggle the .invert class on the logo and menu button based on the slide’s background.

To dynamically invert the colors of your logo and menu button in Webflow based on the background color of your slider, you'll need to use JavaScript to detect changes and apply a class or invert styles automatically.

Assign unique IDs or classes to your logo and menu button in the Webflow Designer (e.g., #logo, #menu-btn).
Ensure the logo is in a format that supports color inversion well (e.g., an SVG or transparent PNG).

2. Structure Your Slider Correctly

Each slide background should have a distinct color or class (e.g., .dark-bg, .light-bg) so the script can detect whether to invert.
Wrap slide content in a container if needed for easier target detection.

3. Add Inversion Styles

Create a CSS class in your Webflow project (in the Custom Code area > inside <style> tags in the <head> section):
Example:
```css
.invert {
filter: invert(1) hue-rotate(180deg);
}
```
This will visually invert white to black and vice versa for most elements like logo and icons.

4. Add Custom JavaScript to Detect Background and Toggle Class

In Webflow Page Settings > Before tag, add JavaScript to:
Detect which slide is currently visible.
Check if it has a “dark” or “light” class.
Add or remove .invert on the logo and menu button automatically.

Example:

<script>  const logo = document.getElementById('logo');  const menuBtn = document.getElementById('menu-btn');  const slider = document.querySelector('.w-slider');  function updateInversion() {    const activeSlide = document.querySelector('.w-slide[aria-hidden="false"]');    if (activeSlide && activeSlide.classList.contains('dark-bg')) {      logo.classList.add('invert');      menuBtn.classList.add('invert');    } else {      logo.classList.remove('invert');      menuBtn.classList.remove('invert');    }  }  // Run on page load  updateInversion();  // Monitor slider change  const observer = new MutationObserver(updateInversion);  observer.observe(document.querySelector('.w-slider-mask'), { attributes: true, subtree: true });  // Fallback on slide clicks/arrows  document.querySelectorAll('.w-slider-arrow-left, .w-slider-arrow-right').forEach(btn => {    btn.addEventListener('click', () => setTimeout(updateInversion, 100));  });</script>

5. Test Transitions and Compatibility

Preview your site and verify the inversion happens automatically as the slider moves.
Adjust detection if you use fade transitions or manage slides differently.

Summary

To invert your logo and menu button colors based on slider background in Webflow, add identifiable classes to slides, create an .invert CSS class with filter: invert(1), and use JavaScript to detect the active slide and toggle the class in real time based on its background class. This ensures your UI adapts dynamically without manual intervention.

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