To prevent the background from scrolling when overlayed with a drop-down menu in Webflow, you can try the following steps:
1. Make sure the drop-down menu is inside a fixed position container.
2. Set the container's position to fixed by selecting it and going to the Styles panel on the right-hand side.
3. In the position dropdown, choose "Fixed."
4. In the Interaction panel, add an interaction to the drop-down menu trigger (such as a button or link) or the drop-down menu itself.
5. In the interaction, add a "While scrolling in view" trigger and specify the drop-down menu container as the target.
6. In the actions section, add a "Scroll into view" action and specify the drop-down menu container as the target.
7. Set the offset to a negative value, such as -100px, to ensure the drop-down menu container is fully visible on the screen.
8. Preview and test your site to see if the background scrolling is prevented when the drop-down menu is activated.
If the above steps don't work, there might be some conflicting CSS or JavaScript on your site. To troubleshoot this further, you can try the following:
1. Check if there are any custom classes or inline styles applied to the navigation dropdown or any of its parent elements that could be causing the issue. Remove or modify those styles if necessary.
2. Disable any custom code or scripts you might have added to the project temporarily to see if they are conflicting with Webflow's built-in functionality.
3. Inspect the page using your browser's developer tools (right-click and select Inspect Element) and look for any errors or warnings in the console tab. Fixing these errors might resolve the issue.
If the problem persists, you might consider reaching out to Webflow support or the Webflow community forums with specific details about your project to get more targeted assistance.