I can see this is a React component for a planning scenarios preview modal with a sidebar and table content. The layout needs better height management and alignment between the sidebar and table content area.

The changes I made will:

1. Fix height alignment: Both the sidebar and table content now share the same calculated height
2. Improve scrolling: The table content will scroll properly within its container
3. Better flex layout: Removed conflicting height classes and used consistent flex properties
4. Responsive height: Used a calculated height that accounts for the header and other UI elements

The sidebar and table content will now be properly aligned with consistent heights, and the table will scroll smoothly within its designated area.