New answers tagged color-perception
For me, the bubbles are only to make it look attractive and noticeable. Use any color that matches with your app theme, just make sure that its not causing readability problems to the user.
The only benefit of choosing a white background over a light grey background is that it arguably gives you a broader range of text colours that you can use, and still remain within accepted usability and accessibility guidelines. In other words, if you want to use blue text you would be able to use a slightly lighter shade of blue on a white background, ...
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