human interface guidelines peaked at apple macintosh os 8 platinum theme. look at these buttons just aching to be poked, but they don't just chocka down like a hard plastic keycap; they flip inverted like a translucent pop-its fidget toy

all of the advancement in graphics hardware since this point in the past should have been real time 3d models to produce the most authentic rendering of these buttons in today's high resolution displays or with the color reflections cast by other windows etc

an illustration from Apple Mac OS 8 Human Interface Guidelines (1997-09-02). An example of a Cancel / OK dialog box is shown, with the user mid-click on the OK button. both rounded-rectangle buttons look like they are made of beveled plastic which squish down inverted when you touch them like a pop-its silicone fidget toy. the "default" button is lined with a little ridge to indicate that's the one that will be triggered if you just press return. both buttons have a solid black outline to make them visually distinct from the panel they're carved into, which also has a beveled edge.
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