Tetradic color schemes are made form two couples of complementary colors in a rectangular shape on the color wheel Generate palettes with more than 5 colors automatically or with color theory rules save unlimited palettes, colors and gradients, and organize them in projects and collections They are very versatile, and work best with one dominant color.
The colors of autumn! - Florin - Medium
Regarding colors, the standard defines two levels of contrast ratio
Aa (minimum contrast) and aaa (enhanced contrast)
The level aa requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (at least 18pt) or bold text.
