Practical color knowledge
Web Color and CSS Guides
Learn CSS text, backgrounds, links, color formats, contrast, mixing and opacity through practical examples.
How to Check Text Color Contrast for WCAG
Measure foreground and background contrast, understand AA and AAA thresholds, and fix failing text without guessing.
Hex vs RGB vs HSL: Which Color Format Should You Use?
Understand how Hex, RGB and HSL represent the same screen color, how alpha works and when each CSS format is most useful.
Digital Color Mixing and Opacity Explained
Learn how screen colors blend, how alpha compositing changes the visible result and how to build useful transition scales.
Styling CSS Link and Placeholder Colors Accessibly
Choose link, hover, visited and placeholder colors that remain recognizable, readable and keyboard friendly.
How to Set Text Color in HTML and CSS
Learn the reliable ways to set readable text colors with CSS, including Hex, RGB, HSL, custom properties and accessible fallbacks.
CSS Background Color: Practical Patterns and Examples
Set solid, transparent and layered CSS backgrounds while preserving readable contrast and predictable color output.