How to align and adjust margins in the grid between rectangle in wpf?

Hi Team

I have a rectangle and in between there is big space in between, want to minimize this space a bit by adjusting the margin of the grid so that it can be pushed a bit closer. How can i achieve such from this below code?

To minimize the space between the rectangles in your WPF Grid, you can adjust the Margin property of the elements to reduce the spacing between them. The Margin property specifies the space around the element in the order Left, Top, Right, Bottom.

The Margin for the second rectangle (Margin="290,104,0,0") places it 290 units to the right of its parent container's left edge. To reduce the space between the two rectangles, decrease the Left margin of the second rectangle. For example: