Auto Invert Font Color Based On Background Color

The plugin automatically sets the font color of your text to either Black or White based on the perceived brightness of its parent container.

Reverse Text Color Based on Background Color Automatically in CSS

Auto-Reverse Text Color Based On Background Color

Pens tagged 'automatic' on CodePen

How to Invert Text and Background Colors in Android and iPhone

Windows shortcut to invert colours that works — Jack Vanlightly

Dark Mode Email: Your Ultimate How-to Guide - Litmus

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background-blend-mode CSS-Tricks - CSS-Tricks