Colors are challenging for me, but I've recently found a technique that works well for me when building a color palette from scratch for a website.
I like to start a design in monotone, setting brightness first with backgrounds, borders and fonts.
From there, I can bump the levels of color to get the desired effects I need, and develop a custom palette for that website. This is very unconventional, but I have been very happy with the results I have been getting.
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