from tkinter import *

def click():
    name = txtbx1.get()
    msg = f"Hola {name}"
    txtbx2["bg"] = "yellow"
    txtbx2["fg"] = "blue"
    txtbx2["text"] = msg

window = Tk()
window.geometry("500x200")

lbl1 = Label(text="Ingresa tu nombre:")
lbl1.place(x=30, y=20)

txtbx1 = Entry()
txtbx1.place(x=150, y=20, width=200, height=25)
txtbx1["justify"] = "center"
txtbx1.focus()

btn1 = Button(text="Presioname", command=click)
btn1.place(x=30, y=50, width=120, height=25)

txtbx2 = Message(text="")
txtbx2.place(x=150, y=50, width=200, height=25)
txtbx2["bg"]="white"
txtbx2["fg"]="black"

window.mainloop()