Why are the colors of the Forbidden City red and yellow?

Yellow: In China's traditional concept, yellow is the noblest, because the Chinese nation originated from the Loess Plateau. Most of the roofs of the Forbidden City Palace use yellow glazed tiles to symbolize the supremacy of imperial power, and ordinary people, even high-ranking officials and nobles, must never use yellow roofs, otherwise it will be a big rebellion.

Red: China has regarded red as a symbol of auspiciousness, jubilation, happiness and joy since ancient times.