Description
Description:
The calculator application's user interface (UI) presents several usability concerns that affect the overall user experience.
Observed Issues:
1) Non-Resizable Window:
The application window's height is fixed and cannot be adjusted, limiting user flexibility.
root.resizable(width=True,height=False)
2) Color Scheme Concerns:
The background is grey, and the buttons are white, resulting in low contrast and potential visibility issues.

Expected Behavior:
Allow users to resize the application window vertically to suit different preferences and screen sizes.
Implement a more contrasting color scheme to enhance readability and visual appeal, such as using darker shades for buttons or background.
Steps to Reproduce:
Launch the calculator application.
Attempt to adjust the window's height by dragging its edges; observe that only the width is adjustable.
Note the color scheme of the background and buttons upon application startup.