How to Achieve Focused Scrolling within a DIV Using Browser Scrollbar?

Utilizing Browser Scrollbar for Focused DIV Content Scrolling

In creating a dynamic website layout, utilizing the browser's main scrollbar to selectively scroll content within a specific DIV is a desired effect. However, achieving this can be challenging, as evidenced by the user's initial attempts.

The key to implementing this behavior lies in applying pure CSS. To achieve this effect, follow these principles:

1. Centered Horizontal Layout: Use margins and widths to align the layout horizontally, adjusting for varying browser window sizes.
2. Main Content Scrolling: Assign a margin-right value to the main content, pushing it away from the sidebar and allowing the browser scrollbar to control its vertical scrolling.
3. Fixed Sidebar: Create a sidebar that remains fixed at the top of the browser window, independent of the main content's scrolling. Control its scrolling separately, and implement scrollbar visibility only when the mouse hovers over.
4. Overflow Handling: When the sidebar reaches its scrolling end, the window's scrollbar takes over.

Refer to the demonstration fiddle provided in the answer to view a working example.

Updated Considerations:

To prevent the main content from scrolling when the mouse hovers over the sidebar, ensure the sidebar is not a child element of the main content's scrolling container. This prevents the scroll event from propagating up to the parent.

Another demonstration fiddle has been provided to illustrate this updated requirement.

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