 <p>The labels and the button should have the same parent.</p> <p>Make these changes:</p> <pre><code>add = Label(app, text="Addition").grid(row=0, column=0) sub = Label(app, text="Subtraction").grid(row=1,column=0) mul = Label(app, text="Multiplication").grid(row=0, column=1) div = Label(app, text="Division").grid(row=1, column=1) </code></pre>