Most interface elements have a boxy shape. Think of text fields, menus, cards, modals, and buttons. The problem with this is that it causes buttons to lose shape contrast.
Buttons should always stand out more than other elements because users need to interact with them to progress their tasks. They should not only have color contrast but shape contrast as well.
Buttons that have a boxy shape blend in with other screen elements. If you want your buttons to stand out, give it a max border-radius. This will fully round the button corners to make it look less boxy. Your buttons will stand out among other elements with shape contrast.
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