Ask for help! About the location of sub-buttons

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1. For example, there are two sub-buttons on the first card in the picture, and their positions are right-aligned. How to make them centered?

2. For example, the second card in the picture has 8 sub-buttons, and they have overflowed the card. How to make many sub-buttons automatically line to the second line, or adjust the layout adaptively according to the width of the card?

Thanks to the author and experts.