How can I properly set the logo to 'Difference' blend mode in Webflow on mobile while also maintaining a black background for a fullscreen takeover with navigation?

You want the logo to use the 'Difference' blend mode for maximum contrast over a fullscreen black background navigation menu on mobile. Webflow supports blend modes, but ensuring correct visibility across backgrounds requires a few setup steps.

1. Set the Logo to Use 'Difference' Blend Mode

• Select your logo element in the Webflow Designer.
• In the Style Panel, scroll to the Effects section.
• Use the Blend Mode dropdown and select Difference.
• This will invert the colors of the logo against the background, maximizing contrast.

2. Create a Fullscreen Black Navigation Overlay

• Use a div block (e.g., "Nav Overlay") that appears on mobile when a menu icon is clicked.
• Set the div's position to fixed, top/left/right/bottom to 0, and z-index above your logo (unless you want the logo on top).
• Give this overlay a black background (background-color: black).
• Set the overlay to display: none by default. Use interactions to display it when the menu opens.

3. Position the Logo Above or Inside the Overlay (Depending on Intent)

• If the logo should remain visible inside the fullscreen nav, move it inside the overlay div and position it as needed.
• If it should remain fixed in place, give it a higher z-index than the overlay.

4. Ensure Proper Blending on a Black Background

• Because ‘Difference’ blend mode works based on color contrast, placing it on a pure black background will invert white elements to white (which may make white logos invisible).
• If your logo is white, the Difference mode on black will make it appear white—but blending effects only work if the logo is above a background.
• If it’s not inverting correctly, make sure there’s no other background color or transparent layer between the logo and the black backdrop.

5. Handle Mobile Responsiveness

• Use Webflow’s mobile breakpoint settings to apply these styles (blend mode, position, etc.) only on mobile if needed.
• For example, set the blend mode only on mobile if it’s not required on desktop.

6. Optimize Z-Index for Interactions

• Z-index stacking is critical. Ensure that the blend mode layer (logo) is above any other divs but not beyond the nav overlay (if embedded).
• Double-check that the logo isn’t being overlaid by invisible elements, which would prevent the blend mode from rendering correctly.

Summary

To apply the Difference blend mode for a logo on mobile with a black fullscreen nav overlay, use the Blend Mode style, ensure the logo is placed above or within a black background, manage z-index layers, and configure interactions to show/hide the overlay as needed. The key is to ensure the logo is blending directly with the intended background layer.