"Red flowers at sunrise are better than fire, and the riverside is as blue as blue" comes from Bai Juyi's Memory of Jiangnan in the Tang Dynasty. Jiangnan is good, it's probably spring.
The phrase "flowers on the riverside win the fire at sunrise" describes the spring flowers on the riverside reflected on the first day, which are redder than flames. It shows the vibrant state of blooming flowers in spring, and makes people feel the rich and warm beauty of spring in Jiangnan. The second sentence says, "The river is as green as blue in spring." Spring water is rippling and blue waves are thousands of miles away. The poet exaggeratedly described it as greener than blue grass. This dark blue and green color is more dazzling in contrast to the fiery red of the above sentence.