forms - Fixed width for buttons or proportional with the text

What is the best practice for a UI, to make all the similar buttons with a fixed-width, no matter how long is the text (with the condition to fit) or make the width proportional with the text and a

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Text fields & Forms design — UI components series, by Taras Bakusevych

android - Percentage width in a RelativeLayout - Stack Overflow

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How to create buttons of fixed width using CSS - Quora

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