@cmadeo provided a slightly different blue to use which had better contrast on the gray widget background
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Testing on iPhone 6 Plus (iOS 11.1.2) and Wikipedia app 5.7.2 (1267). Featured article widget "Save for later" button color is shown in screencaps below, I have posted two examples as this is a tough call comparing them to the "After" photo above, the reason being my devices do not cap the exact color specs on the screen.
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Wikipedia app 5.7.3 (1281) - Looks good to me, especially if it looks good to @cmadeo