What are the calligraphy features and characteristics of the works of Red Cliff Fu?

The post "Red Cliff Fu" was written by Yuan Feng when he demoted Huangzhou in six years. The postscript said: "I am afraid of things. Love me and hide. " It can be seen that Su Dongpo has a feeling of fear at this time. Calligraphy is also carefully written. In the Ming Dynasty, his calligraphy lacked three lines, which were supplemented by Wen Zhiming. Dong Qichang said, "Mr. Dongpo's gift has become a family of Chu Sao; This book is one of the collections of Lanting. The character of Song people is based on this. "