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Are there any workarounds or tips to create long modal windows in Webflow that can be scrolled and have a fixed background with a semitransparent overlay?

TL;DR
  • Create a full-screen fixed modal wrapper with a semitransparent background and center scrollable content using Flexbox.
  • Set modal content to a max height with overflow: auto for scrollability, lock background scroll by setting body overflow to hidden on open, and add interactions to close the modal.

You can absolutely create scrollable long modal windows in Webflow with a fixed background and semitransparent overlay using some key layout settings and interaction structure.

1. Create the Modal Structure

  • Create a div block for the modal wrapper and position it as fixed, full screen (top: 0, bottom: 0, left: 0, right: 0).
  • Set its z-index high (e.g., 9999) and background color to rgba(0, 0, 0, 0.5) for transparency.
  • Inside this wrapper, create another div block for the modal content. This will hold the scrollable content.

2. Enable Scroll for Modal Content

  • Set the modal content div to have:
  • Fixed width or max-width pattern (e.g., 600px or 80vw)
  • Max height (e.g., 80vh) and overflow: auto
  • This ensures the modal content scrolls internally while retaining a fixed overlay behind.

3. Center the Modal Content

  • Use Flexbox on the modal wrapper (display: flex; justify: center; align: center) to center the modal even when viewport size changes.
  • Scroll behavior will stay inside the modal content div if properly limited with height and overflow settings.

4. Lock Background Scroll

  • To prevent scrolling of the underlying page when the modal is open:
  • Create an interaction on the modal trigger that:
    • Uses the “Page > When Modal Opens” set to overflow: hidden on the body
  • On modal close:
    • Set overflow: auto (or visible) back to the body

5. Add Close Functionality

  • Add a close button inside the modal.
  • Use Webflow Interactions to hide or scale down the modal wrapper on click.
  • Optionally, add a click interaction on the background wrapper (outside modal content) to also trigger the close.

6. Optional Enhancements

  • To ensure mobile-friendliness, always test your vh height limits since mobile browsers may ignore or miscalculate vh units due to address bar sizes.
  • Consider using calc(100vh - some value) or dynamic sizing with min-height for better responsiveness.

Summary

To create a long, scrollable modal window with a fixed semitransparent overlay, use a full-screen fixed modal wrapper with centered modal content set to a limited height and overflow: auto. Lock background scroll using overflow: hidden on the body, and use interactions for opening and closing the modal.

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