I'll create a realtime mountain/area chart similar to the SciChart example using Recharts. Let's build this with a dark theme, gradient fill, and realtime data updates:

This implementation creates a realtime mountain/area chart similar to the SciChart example you shared, but using Recharts. Here's what it includes:

1. Dark Theme: The chart has a dark blue/slate background similar to the SciChart example.
2. Gradient Fill: The area under the line has a cyan gradient that fades from top to bottom.
3. Realtime Updates: The chart updates every 100ms with new data points, creating a smooth animation effect.
4. Smooth Curves: Using the "monotone" interpolation type for smooth transitions between data points.
5. Grid Lines: Includes CartesianGrid with dashed lines for better readability.

The chart maintains a fixed number of data points (100) and shifts the data as new points are added, creating the scrolling effect. The data values fluctuate randomly but with constraints to prevent extreme jumps, similar to the example you shared.

You can adjust the colors, update frequency, or data generation logic to better match your specific requirements.

You're right, let me fix the gradient fill to make it more prominent and similar to the SciChart example:

I've enhanced the gradient fill to better match the SciChart example. The new gradient transitions from a light cyan/teal color at the top to a deeper blue at the bottom, with appropriate opacity settings to create that mountain chart effect.

The key improvements are:

1. Enhanced Gradient: Changed from a single-color gradient with opacity variation to a two-color gradient (cyan to blue) that better matches the SciChart example.
2. Explicit Opacity: Added fillOpacity={1} to ensure the gradient is fully visible.
3. Adjusted Background: Updated the background colors to a deeper blue that better matches the SciChart example.
4. Improved Stroke Color: Adjusted the line color to match the gradient's top color for a more cohesive look.

These changes should make the gradient fill much more prominent and visually similar to the SciChart example you shared.