Answered
Is this possible to fix width and height of text in \fbox. If I have two texts like \fbox{α} and \fbox{Δ}, they will have different sized box irrespective of selecting both small text.
Or can I have buttons with square corners, not round corners.
The same question 
You can use an image (PNG or SVG) as a button (just add a script to it!)
\texttt does equal width
\vphantom{} does equal high
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