from tkinter import *
from tkinter import ttk

def option_selected(*args):
    selected = selected_conversion.get()
    print(f"You selected: {selected}")

# Main GUI window
root = Tk()
root.title("Dropdown Example")

# Dropdown options
conversion_options = ["cm to inches", "m to feet", "km to miles"]

# Variable to store selected option
selected_conversion = StringVar()
selected_conversion.set(conversion_options[0])  # Default value

# Style configuration for ttk OptionMenu
style = ttk.Style()
style.configure("Custom.TMenubutton",
                font=("Arial", 11),
                background="#DFF0D8",
                foreground="#333",
                padding=5)

# Create dropdown
dropdown = ttk.OptionMenu(root, selected_conversion,
                          conversion_options[0],
                          *conversion_options,
                          command=option_selected)
dropdown.config(style="Custom.TMenubutton")
dropdown.pack(pady=20, padx=20)

root.mainloop()