Make a fixed position of translate button in pop-up window

[migozz]

Body

In a pop-up window, there is a button for translate. The pop-up window displays the checkbox "always translate from English", which is above the buttons, and buttons Translate and settings. When you click Translate, there is a buttons Show source and Show Translate selected text checkbox, which is below the buttons.
The issue is that when you click Translate, the position of Translate button changes, and you can't click it back, because the mouse cursor is on the white space. You should make a fixed position for all elements so that buttons will not move.
Why the upper check box hides, and the lower appears?

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