Dark mode has become an expected option for many types of sites and applications, but doing it well requires more than a simple color inversion.
Pure Black Isn't Always Best
Very dark gray backgrounds are often more comfortable to look at for extended periods than pure black, which can create harsh contrast with light text.
Colors Need Rechecking
A color that reads well on a light background may need adjustment to maintain proper contrast and legibility against a dark one.
Images and Icons
Some images and icons designed for light backgrounds look poor or invisible on dark ones — dark mode support sometimes requires separate assets, not just a CSS toggle.
Test Both Modes Thoroughly
Every page and component should be checked in both light and dark mode, since issues in one mode are easy to miss if you're primarily designing in the other.
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