Good thinking from Paul Herbert on the Cloudfour blog about colorizing a component. You might look at a design comp and see a card component with a header background of #dddddd, content background of #ffffff, on an overall background of #eeeeee. OK, easy enough. But what if the overall background becomes #dddddd? Now your header looks lost within it.
That darker header? Design-wise, it’s not being exactly #dddddd that’s important; it’s about looking slightly darker than the background. When that’s the case, a background of, say rgba(0, 0, 0, 0.135) is more resiliant.
That will then remain resilient against backgrounds of any kind.
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