yellow

Yellow (#FFFF00) is pure, maximum-intensity yellow in the CSS standard — the complete combination of maximum red and green with zero blue in the RGB model, one of the three additive primary light colours. As the brightest colour perceived by human eyes at any given luminosity, yellow naturally demands attention and is universally associated with sunshine, warmth, caution, and intellectual energy. In design, pure #FFFF00 is often too intense for large areas but provides unmatched visibility for highlights and alerts.

Pure yellow is the most luminous color in the spectrum, instantly associated with sunshine, optimism, and alertness. It stimulates the nervous system and enhances concentration, which is why it appears on school buses and warning signs. Yellow demands attention faster than any other color.

Medium yellow is powerful for attention badges, star ratings, and highlight accents in otherwise neutral interfaces. It is one of the hardest colors to use as a primary brand color because of contrast limitations against white. Dark text on yellow achieves strong readability, making it effective for caution banners.