What will the "background-color" of the "topButton" be when the program is finished running?

Blue

Explanation:

set_Property - (topButton), (#background-color), (orange)

set_Property - (bottomButton), (#background-color), (red)

set_Property - (topButton), (#background-color), (blue)

set_Property - (bottomButton), (#background-color), (green)

Here, the background color for the 'topButton' would be "blue"  when the program is finished running, as it is the last task, the topButton would be set to or it is the last thing that will run for the button.

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credit to ace:  

batradivjyot25.